Try a local Clark dealer - go to their website clarkmhc.com to help you locate one. Be prepared to have the complete model number (C500 is only a design series for trucks from 2500lb to 30,000 lb capacityies in pneumatic, solid cushion or electrict counterbalanced type) & most importly the serial number which contains a lot number, a 4 digit # in the middle of the s/n sequence. Parts are ID by this lot number. If you can't find it on the data plate it will be stamped in the frame - generally near the front of the unit. Good Luck.