ARANA ML99-45 10 inch 45 lb Gas Struts for Truck Tool Box &

These two gas springs deliver a compact 10.00" extended length with a 3.54" stroke and 6.46" compressed length, providing 254N (45 lb) of supporting force for lids weighing between 36 and 50 pounds. They’re made to replace common OEM numbers like 10159-31, ML99-45, and SL99-45-1, giving you a straightforward upgrade or repair option for many toolbox and cabinet applications.

How do these gas struts improve opening and closing of a heavy toolbox lid?

The ARANA ML99-45 struts reduce the effort required to lift heavy lids while controlling the descent for a safe close. They stabilize motion and prevent lids from slamming shut or dropping unexpectedly, making access easier and safer.

• 45 lb (254N) support tailored for 36–50 lb lids
• Smooth gas-assisted lift and damped closing
• Compact 10" size fits tight installation spaces
• OEM-compatible fit for many popular toolbox brands

Will these struts fit my truck toolbox or cabinet?

They are engineered to work with a wide range of toolboxes (Weather Guard, Husky, Better Built, UWS, Delta, Kobalt and similar) as well as cabinets, boat hatches, and custom boxes. To ensure correct performance, measure your lid and confirm the weight falls in the recommended 36–50 lb range before purchasing.

• Compatible with many OEM part numbers including 10159-31
• Suitable for lids, hatches, and custom enclosures
• Check lid weight rather than only dimensions
• Not intended for lids outside the specified weight range

How difficult is installation and what tools are required?

Installation is fast and beginner-friendly—most users can complete the swap in about five minutes using only a screwdriver and basic measurements. Note that mounting brackets and screws are not included, so have the correct hardware ready or reuse your existing brackets when possible.

• Estimated installation time: ~5 minutes per strut pair
• Required tools: screwdriver and a measuring tape
• Mounting brackets/screws: not included—reuse existing hardware or purchase separately
• Direct OEM-fit design minimizes alignment hassles

What warranty or support does ARANA provide if something goes wrong?

ARANA backs these gas struts with 365 days of after-sales support to help with fitment questions or performance concerns. Contact customer service for troubleshooting, replacement guidance, or warranty assistance if you encounter issues after delivery.

• One-year customer support for fitment and quality questions
• Support channels available for replacement guidance
• Clear OEM cross-reference to simplify ordering the right part
• Affordable option with factory-fit design

Who is this for: The ARANA ML99-45 10" gas strut pair is aimed at tradespeople, truck owners, and DIYers who need a reliable, OEM-compatible lift aid for medium-weight lids and hatches. If you maintain or replace hardware on toolboxes, service compartments, boat hatches, or workshop cabinets and your lid weighs between 36 and 50 pounds, these gas springs offer a compact, quick-to-install solution that restores controlled opening and safe closing.