Received the O-rings from Mcmaster and with my MM micrometer have found them to be very close to what I need for the Anti Dive unit. They should work with no problems, thanks again for the heads up on this company. Now just have to install them. Perfect! Now I just have to figure out what to do with the other 49 sets of O-rings as they came in packs of 50 each, so I can do 49 other anti dive units.