3" Blue Marine Registration Kit – Fits All Boat Brands & PWC (Replaces STIFFIE Shift Blue SH05, Hardline BLU350EC, STIFFIE HL102)
3" Blue Marine Registration Kit – Fits All Boat Brands & PWC (Replaces STIFFIE Shift Blue SH05, Hardline BLU350EC, STIFFIE HL102) is backordered and will ship as soon as it is back in stock.
Worry-free returns
Worry-free returns
Shop with confidence. If you’re not completely satisfied, eligible items may be returned within the return window, provided they are unused and in original packaging.
If the return is due to our error or a defective item, we’ll make it right.
Please contact us before returning any item.
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.
3" Blue Marine Registration Kit – Fits All Boat Brands & P...
3" Blue Marine Registration Kit – Fits All Boat Brands & PWC (Replaces STIFFIE Shift Blue SH05, Hardline BLU350EC, STIFFIE HL102) is backordered and will ship as soon as it is back in stock.
Product Details
This universal 3" Blue Marine Boat Registration Numbers and Letters Kit is designed for a perfect fit on all boat brands and personal watercraft (PWC). The 3-inch height of these decals meets US Coast Guard (USCG) requirements for vessel registration when installed correctly, ensuring you stay compliant on the water.
This kit serves as a direct replacement for STIFFIE Shift Blue SH05, Hardline Products BLU350EC, and STIFFIE Hardline Fl. Blue/Pink HL102.
- Easy Installation: Simply peel and apply the self-adhesive decals to any clean, smooth surface.
- Built for Marine Use: Made from premium outdoor vinyl that is UV-coated for sun protection, waterproof, and resistant to fuel and scratches.
- Complete Set: Includes four full sets of letters A-Z and numbers 0-9, providing all characters needed for your vessel's registration code.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| STIFFIE | SH05 |
| Hardline Products | BLU350EC |
| STIFFIE | HL102 |
Engine & Model Compatibility
This is a universal product compatible with all boat brands and personal watercraft requiring registration numbers, including models from Sea-Doo, Yamaha, Kawasaki, Honda, and more.
Technical Specs
- Product Type
- Marine Registration Numbers and Letters Kit
- Installation
- Peel and Apply Adhesive Decals
- Material
- Premium Outdoor Vinyl
- Color
- Blue
- Dimensions
- 3 inches (76.2 mm) height
- Features
- UV Coated for sun protection, waterproof adhesive, fuel and scratch resistant
What’s in the Box
- 4 x Sets of Letters A-Z
- 4 x Sets of Numbers 0-9
- Total: 144-146 individual decals
Installation Notes
- Prepare Surface: Thoroughly clean the application area with soap and water or rubbing alcohol to remove any dirt, wax, or grease. Ensure the surface is completely dry before proceeding.
- Plan Layout: Arrange your numbers and letters before peeling the backing to ensure correct spacing and alignment. Use a measuring tape and masking tape to create a straight guideline on the hull.
- Apply Decals: Peel each decal from its backing and carefully apply it to the designated spot, starting from one edge and smoothing it out to prevent air bubbles.
- Secure Adhesion: Once all decals are in place, use a squeegee or credit card to press firmly over the entire surface of each one, ensuring a strong bond with the hull.
- Cure Time: Allow the decals at least 24 hours to fully cure and bond to the surface before exposing the vessel to water.
Troubleshooting & FAQ
How do I ensure these numbers meet USCG requirements?
The decals themselves are 3 inches in height, which meets the minimum size requirement. To be fully compliant, you must also ensure they are: placed on the forward half of your vessel on both sides, are in a color that contrasts with your hull, and are plain block letters, not script or slanted.
What is the best way to align the numbers and letters?
Use a strip of painter's or masking tape to create a straight bottom edge on your hull. Align the bottom of each decal with the tape as you apply them. You can also use a small level to ensure your guideline is perfectly horizontal.
Can I apply these to an inflatable boat (PWC)?
These decals are designed for rigid, smooth surfaces like fiberglass or painted aluminum. They may not adhere properly to the flexible, textured surface of an inflatable boat. For inflatables, it is recommended to use a registration plate kit instead.
How do I remove old registration numbers?
Gently warm the old decals with a hairdryer or heat gun on a low setting to soften the adhesive. Use a plastic scraper or your fingernail to peel them off. Any remaining adhesive residue can be removed with a dedicated adhesive remover or rubbing alcohol.
Will the color fade in the sun?
These decals are coated with a UV protectant layer to resist fading from sun exposure, ensuring the color remains vibrant for years of service.
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
Payment methods
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
