:wave Im rebuilding a 7E5888 pump serial 3ZJ49560 an inquiring about the oring on the front where it bolts to the front engine plate.I've had trouble with it leaking before. my parts manaul calls for 6V7681 oring but a 6V3199 comes with gasket kit. The first is larger in circumfrence than the second and will stay in the grove after you walk it in a couple of times. The second has to be streched slightly over nose cone to the grove. Both orings are same diameter (.038).I can't rember which one worked the best:stupid. your help is appreciated.