Its a replacement.. Its actually a Ski Doo shock.. Just started looking at lengths on evilbay til I found a suitable one.. It has a lot beefier shaft and moves in the proper parameters of the original.And it was only 10 bucks.. Doesn't open as far,but still well within the available movement range. For the skis ,I used Polaris Indy ski shocks and bored the holes in the bushings to 7/16 and shimmed the bushings to the mounts since all they do basically is keep the skis from flopping around.