That appears to be a GM factory number, not an aftermarket replacement. It's most likely to be a "standard" size, 2.3125" shaft size, but the only way to be sure would be to measure the crankshaft. Undersize replacements would be marked with a 10, 20, or 30, etc. indicating a reground "undersize" shaft diameter. A close, but not necessarily exact measurement can be done with a dial caliper- - - -for less than $20.00 online, I can't think or a reason anybody's basic tool box shouldn't include one.

www.ebay.com/itm/204675764914?

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!