Partsam Square Tail Light Mounting Box Set — Black S45C Steel, Left & Right with Number Plate Bracket

Partsam’s heavy-duty S45C steel square tail light mounting boxes (left and right) with a license plate bracket provide a rugged, corrosion-resistant housing to secure square LED trailer lights and protect wiring on trailers under 80" and similar vehicles.

These welded mounting boxes and included license plate bracket are engineered from 45 gauge S45C (1045) steel, finished in black paint to resist the elements and streamline installation for trailers, trucks, campers, boats and commercial vehicles. The kit contains two mirror-image tail light mounts and one slim license plate bracket plus the screws you need to quickly swap or upgrade factory housings. It’s a straightforward replacement choice when you want stronger protection for square LED lights and a neat, road-ready look.

How do these mounting boxes protect my trailer lights?

The boxes surround square LED tail lights with a solid steel shell that shields the lamp lens and wiring from impacts, mud and road spray. Their welded construction reduces flex and keeps connectors aligned so lights stay sealed and functional under vibration.

• 45 gauge S45C 1045 heavy-duty steel resists dents and deformation
• Black painted finish helps prevent surface corrosion
• Rigid shape maintains seal and wiring position under vibration
• Included screws ensure tight, reliable mounting

Will these fit my vehicle and square LED lights?

These boxes are sized and shaped to accept standard square LED trailer lights and fit most trailers under 80" wide, along with many trucks, RVs, boats and specialty vehicles. Check your light dimensions against the box opening to confirm compatibility before ordering.

• Outer box dimensions: 6.3" x 5.5" x 3.15" for lamp enclosure
• Slim license plate bracket measures 9.05" x 1.1" with 0.04" thickness
• Designed for square LED tail lights commonly used on trailers and campers
• Includes left and right orientations for direct replacement

How easy is installation and what’s included?

Installation is straightforward: remove your old housings, mount each box in the correct orientation, secure with the supplied screws, and fit the square LED lights into the openings. The set includes both left and right boxes plus a license plate bracket so you have the essential parts in one package.

• Kit contains 2pcs (left + right) tail light mounting boxes and 1 license plate bracket
• All required screws included for standard mounting points
• Pre-finished black paint reduces the need for immediate touch-up
• Simple bolt-on replacement for many OEM housings

How does the material and finish hold up outdoors?

S45C (1045) steel offers high strength for impact resistance; the black painted surface creates a protective layer against moisture and road debris. While painted steel is durable for most towing and marine uses, occasional inspection and touch-up in high-salt or highly corrosive environments will extend service life.

• S45C 1045 steel provides robust structural protection
• Black paint finish reduces rust risk and blends with common trailer colors
• Recommended to inspect mounting points and paint annually
• Suitable for repeated highway and off-road use with proper maintenance

Who is this for: The Partsam S45C steel tail light mounting box set is aimed at trailer owners, boaters, RV and truck operators, and fleet managers who need a durable, bolt-on replacement for square LED tail light housings. If you want stronger protection than plastic housings, a unified left/right kit with a license plate bracket, and a straightforward install using supplied screws, this heavy-duty steel solution is built for your daily towing, marine or commercial needs.