Qty (2) Camper Rear Window, Tonneau Cover Lift Supports, Struts. Suspa C16-21081 C1621081 This listing includes 2 Lift Supports For the Tonneau Cover. Extended Length from Center Mount to Center Mount is 28.90 in. Suspa supports are Made in the USA, install easily in minutes, often times without special tools required. Displayed shipping rate apply to the contiguous 48 States only. Additional surcharge applies to PUERTO RICO, HAWAII, ALASKA & OTHER US TERRITORIES.. Interchangable with the following OEM Numbers: C1611562A,C16-11562A,C1617551,C16-17551,C1621081,C16-21081