RandyB
If you check the link,
http://www.teamassociated.com/misc/d.../db_kittc5.htm part #6465 it shows that just about any shock piston that associate makes, fits the TC5. The extra pistons that I had from one of my older TC3 kits has pistons that are identical to the TC5's. The older Associate kits used to come with an assortment of pistons.