I was searching for packing for a SD2200 no one was able to help,so maybe this will help someone else. I took it apart and it was a peace of cake. It has a piston that takes a 65MM X 75MM X 6MM U-Seal and a back up ring. You can get them at any hyd.shop that sells metric seals. I got mine at P&H Hydraulic Service in Jax. Fl. Now back to work.