Last time I changed fuel injector o-rings on a 92' K75, I buggered one up by using all three thumbs and used an old one. I didn't order a spare because of the price. ($4+) each for 6, if I remember correctly. Anybody using local (car parts?) suppliers as they must be a standard good quality variety available. I do use almost all OEM parts for obvious reasons until they become ridiculously priced. Charlie