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Check out the Part #'s pdf catalog in the Downloads section at Crossedflags.com. It has pictures, and part #'s too of course, and best of all....it's free!
I believe there is no separate part number for the crankshaft position sensor exitor ring (as the parts manual calls it). It is supplied as part of the crankshaft and is listed as such in the parts book.
You can probably buy one separately but are most likely already installed on the stock crankshaft if you buy one. My parts manual, however, lists the part with no part number and states it is supplied with the crankshaft.
Call Bob Wendorf at Fichtner Chevy and I'm sure he can help you. 406-628-4618