Boat Registration Letter and Number Kit – NorthBoat – 3" Smooth Green (Replaces STIFFIE Hardline Green Series, Hardline Products WHI350EC, SeaSierra Green Registration Kit)
Boat Registration Letter and Number Kit – NorthBoat – 3" Smooth Green (Replaces STIFFIE Hardline Green Series, Hardline Products WHI350EC, SeaSierra Green Registration Kit) is backordered and will ship as soon as it is back in stock.
Worry-free returns
Worry-free returns
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Delivery and Shipping
Delivery and Shipping
Orders are typically processed within 1–2 business days.
U.S. orders usually arrive within 6–15 days, depending on stock location and destination.
International delivery times may vary due to customs processing.
Tracking information will be provided once your order ships.
Boat Registration Letter and Number Kit – NorthBoat – 3" Smoot...
Boat Registration Letter and Number Kit – NorthBoat – 3" Smooth Green (Replaces STIFFIE Hardline Green Series, Hardline Products WHI350EC, SeaSierra Green Registration Kit) is backordered and will ship as soon as it is back in stock.
Product Details
This NorthBoat green Boat Registration Letter and Number Kit provides a complete solution for marine vessel registration. The kit features 3-inch smooth, block-style letters and numbers, precision-cut from high-quality vinyl. Designed to meet US Coast Guard requirements, these decals are perfect for boats, yachts, and personal watercraft (PWC).
This kit serves as a direct replacement for STIFFIE Hardline Green Series, Hardline Products WHI350EC, and the SeaSierra Green Registration Kit.
- Easy peel-and-stick installation suitable for DIY application.
- Engineered to endure harsh marine conditions; resistant to water, UV rays, fuel, and scratches.
- Includes four complete sets of A-Z and 0-9, totaling 144 characters to cover any registration sequence.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| STIFFIE | Hardline Green Series |
| Hardline Products | WHI350EC |
| SeaSierra | Green Registration Kit |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
| Vessel Type | Usage | Notes |
|---|---|---|
| Boats | Registration identification | Apply to both sides of vessel in contrasting color to hull |
| Yachts | Registration identification | Apply to forward half of vessel per federal regulations |
| Personal Watercraft (PWC) | Registration identification | Apply to both sides in contrasting color |
| Pontoons | Registration identification | Apply to forward half of vessel |
| Jet Skis | Registration identification | Apply to both sides in contrasting color |
| Waverunners | Registration identification | Apply per state regulations |
| Sea-Doos | Registration identification | Apply per state regulations |
Technical Specs
- Product Type
- Boat Registration Decals
- Installation
- Peel and Stick
- Decal Height
- 3 inches (76.2 mm)
- Font Style
- Smooth (Block Style)
- Color
- Green
- Material
- Waterproof Vinyl with High-Tack Adhesive
- UV Protection
- Yes, UV Clear Coating
- Scratch Resistant
- Yes
- Contents
- 4 sets of A-Z and 0-9 (144 total characters)
- Character Count
- 144 total decals (4 of each letter/number)
- Special Features
- Fuel resistant, Fade resistant, Waterproof, Anti-curl
- Compliance
- Meets US Coast Guard requirements for vessel registration
- Usage
- Boats, Yachts, Personal Watercraft (PWC)
What’s in the Box
- 1 x Set of 144 Green Registration Decals (A-Z, 0-9, 4 of each character)
Installation Notes
- Clean the application surface thoroughly to ensure it is free of dirt, oil, and wax.
- Wash your hands before handling the decals to prevent contaminating the adhesive.
- Create a straight guideline for installation using a pencil or masking tape with a straight edge.
- Identify the designated location for registration numbers, typically on the forward half of the vessel.
- Begin applying decals with the middle character of your registration number, positioning it at the center of your guideline.
- Space characters evenly, following federal and state registration requirements for spacing.
- Apply the decals to both sides of the vessel in a color that clearly contrasts with the hull.
- Allow 24-48 hours for the decals to fully set and bond to the surface, depending on ambient temperature.
Troubleshooting & FAQ
What are these decals used for and where do I apply them?
These decals are for displaying official boat registration numbers. Per USCG regulations, they should be applied to both sides of the forward half of your vessel, in a color that contrasts with the hull for clear visibility.
How do I ensure the decals are applied straight?
Use a pencil or a strip of masking tape to create a straight horizontal guideline on the hull. Apply the middle character of your registration number first, then work outwards to ensure even spacing and alignment.
Are these decals durable enough for marine environments?
Yes. They are manufactured from waterproof, fuel-resistant, and UV-coated vinyl with a high-tack adhesive to withstand sun, water, and scratching, preventing fading and peeling.
How many letters and numbers are included in one kit?
The kit contains 144 characters in total, which includes four complete sets of the alphabet (A-Z) and four complete sets of numbers (0-9). This is sufficient for any standard registration number sequence.
Do these decals meet legal requirements for registration?
Yes, the 3-inch height and simple block-style font meet the common requirements set by the U.S. Coast Guard for recreational vessel registration identification.
What is the most important step for a successful installation?
Proper surface preparation is critical. The application area must be thoroughly cleaned to remove any dirt, oil, wax, or residue to ensure the high-tack adhesive bonds correctly and permanently.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
Payment & Security
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