If you have a sample of the o-ring, I would suggest taking it to a local parts supplier. Someone like BDI Canada in Windsor, they will be able to measure it up and order you some, if they don't have it on their shelf. Trust me, they will cost you a lot less than anywhere else, the o-ring material is just regular BUNA. You might have to buy a package of 10 pcs, but worth the savings!!