The Triton 08158 Snowmobile Trailer Coverall Gas Shock -1025N is the gas shock lift kit used on 10 foot Triton clamshell style snowmobile trailers. It opens the rear of the trailer only. Swiveling bolts at either end are part of the gas shock assembly and serve to attach to the trailer with mounting nuts. Shocks are sold individually, but we recommend replacing both when one goes out, as both shocks will have a similar lifespan and wear and tear characteristics. Do not open or puncture the shock canister during replacement as the contents are under high pressure and could cause serious injury.