If the old cushion broke, its the original small one. You need to install the new design as its much stronger. You must put the shaft in a vice. Use old steel collars ti help hold the cyl. Heat the tube with torches and put a large pipe wrench on the old cushion (shock) Use a large hammer to strike the wrench and break the cushion free. It will unscrew off the chrome cyl. Install the new design cushion # 1087284. Use lock tite to install it!
You need a new seal kit for the gland. Before putting back together, make sure to put a magnet down the cyl (if you didnt take the cyl out) to get those pieces. They will come back to haunt you!
And most important!!!>>>those 3 screws at the top of the cyl must be installed after the cyl is put in the tube and tightened. Then install the collar with the ring upward, then the spring and finally the gland and snap ring. If you install the 3 srcews last, you will ruin the whole cyl! The parts all sit on top of those screws.