The full circle seal I suggested has a lip that will accommodate a "Speedy Sleeve". The specifications on the seal state that it will expand up to .015" oversize from its nominal diameter of 3 7/8". A worn crankshaft seal surface that does not give the rear seal a smooth area to run on could probably benefit from a repair sleeve, which is stainless steel, and far more wear-resistant than the original crankshaft material, IMHO.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!