I've tried to locate CAT, the crankshaft manufacture that's in your engine and the only thing I could come up with is this company on Ebay. Looks like they work out of Corona, California selling a variety of internal engine parts. Maybe just a depot for distributing stuff from overseas?
https://www.ebay.com/usr/catracingproducts
If you scroll down a bit on the link they are following a company called Perfect Crank.
I know its a long shot but maybe send a message and see if either one of these companies can give any sort of info on your crankshaft. Worth a try?