C16-20651 C16-33313 18 inch 40lb/178N Gas Strut Shock

This AUCLIDIS 18-inch gas strut pair (40 lb / 178 N) replaces OEM C16-20651/C16-33313 lift supports for camper shells, truck toppers, toolboxes and canopy doors to restore smooth opening and secure hold.

These gas springs are a direct-fit aftermarket replacement designed for truck camper shells, topper caps, snugtop canopies, toolbox lids and similar hinged panels. Each set includes two matching struts with nylon 10 mm ball-socket ends and commonly interchangeable part numbers so you can match your original OEM identifier. The struts are intended to return controlled lift support and hold the panel in its open position when sized correctly.

How do I confirm this gas strut fits my camper shell or topper?

Match the part numbers stamped on your existing strut or measure the ball-center lengths. This AUCLIDIS set is listed under several interchange numbers, making cross-referencing straightforward.

• Check for OEM numbers: C1620651, C16-20651, C16-33313, C16-33299, C16-14734, SE187P40, etc.
• Measure extended length from ball center to ball center: 18.70 inches.
• Measure compressed length: 10.82 inches to confirm travel compatibility.
• Confirm both ends use 10 mm nylon ball sockets for mounting match.

What are the key specs and lifting capacity of these lift supports?

These struts deliver about 40 pounds (178 N) of force, suitable for many medium-weight camper doors and toolbox lids. The construction includes standard nylon ball-socket connectors for easy swap-in.

• Rated force: 40 lb (178 N) per strut — use two for balanced support.
• Extended length: 18.70 in; compressed length: 10.82 in.
• End fittings: 10 mm nylon ball sockets at both piston and body ends.
• Sold as a set of two for left and right side replacement.

How do I install and maintain AUCLIDIS gas struts?

Installation is straightforward and typically requires no special tools beyond simple hand tools to remove ball studs. Orientation and correct length are important — install with the piston rod facing down when possible for optimal longevity.

• Remove old strut by detaching from ball studs; retain or replace mounting hardware as needed.
• Snap new 10 mm ball sockets onto corresponding ball studs until secure.
• Check operation slowly, ensuring even lift and full travel without binding.
• Clean around mounting points and avoid puncturing the piston rod to prevent damage.

Who is this for? This AUCLIDIS pair is aimed at vehicle owners, mechanics and DIYers replacing worn or weak lift supports on camper shells, truck toppers, snugtop canopies, toolbox lids and similar hinged panels. If your original struts match the listed interchange numbers or the measured ball-center lengths align with the 18.70" extended and 10.82" compressed dimensions, this set provides a cost-effective direct-replacement option. AUCLIDIS includes two struts per package and offers customer support with a 12-month replacement policy to help with fitment questions or part issues.