AUCLIDIS 18" Gas Strut Pair 40 lb Lift Support — 18.70" Extended, Nylon Ball-Socket Ends (Set of 2)

If your truck topper, camper shell or toolbox lid feels heavy or won't stay open reliably, this pair of replacement gas struts restores confident, controlled lifting. These pistons match common OEM interchange numbers and come with nylon ball-socket fittings on both ends for straightforward swap-in installation without cutting or welding. The package contains two matched struts and AUCLIDIS stands behind them with customer support and a 12-month replacement promise.

Will these gas struts fit my camper shell or truck topper?

Compatibility depends on matching the original part numbers and connection style rather than the vehicle model itself. Verify the code stamped on your existing strut against known interchange numbers to confirm a suitable replacement. Also check the ball-socket diameter and extended/compressed lengths to ensure proper fit and geometry.

• Interchangeable numbers include C16-20651, C16-33313, SE187P40 and others listed on the original piston.
• Nylon ball sockets on both ends, 10 mm ball diameter for direct swap.
• Extended length 18.70" and compressed length 10.82" measured center-to-center.
• 40 lb (178 N) force rating suitable for many camper shells, toppers and toolboxes.

How do I measure and install these replacement struts correctly?

Measure center-to-center between the ball stud fittings on your current strut when fully extended and compressed to confirm dimensions match. Installation typically requires removing the old strut from its ball studs and snapping the new nylon-socket ends onto the studs—no special tools needed in most cases. Work with the door supported or use a helper to avoid sudden closure while swapping struts.

• Confirm extended length ~18.70" and compressed length ~10.82" center-to-center.
• Check ball-stud size (10 mm) and nylon socket compatibility.
• Swap one end at a time while supporting the lid for safety.
• No cutting, drilling, or special adapters usually required for matching fittings.

What does the 40 lb (178 N) rating mean for everyday use?

The 40 lb rating indicates the approximate upward force the gas strut applies to assist lifting and holding the lid. It won't make a heavy door weightless but will reduce the effort required and hold the panel open under normal conditions. If your lid is significantly heavier due to added racks or accessories, choose a higher-rated strut designed for heavier loads.

• 40 lb (178 N) provides steady lift and positive hold for typical camper doors.
• Not intended to compensate for heavy aftermarket additions like roof racks.
• Two matched struts ensure balanced lifting and consistent operation.
• Proper selection prevents premature wear and maintains safe opening angles.

Who is this for: This set is aimed at pickup owners, DIY mechanics and service shops needing a direct replacement for worn or failed gas struts on camper shells, truck toppers, SnugTop-style caps, canopy doors and toolboxes. It suits anyone who can measure their original strut, confirm an interchange part number, and perform a straightforward side-by-side swap. Choose these if you want a matched pair with standard 10 mm nylon ball sockets, clear fit dimensions, and the support of a one-year replacement policy from AUCLIDIS.