I just thought you could tell by how much off the one you have now is. For instance if it's 1/2" too shallow you'd need one that's a 1/2" deeper. I'll look and see if any of the ones I have are the # Steve said it is.
I thought you can just use one groove on a double groove alternator pulley but if it doesn't line up I'm nearly positive I have a brand new single groove alternator pulley. I recently bought a new alternator and took it off to put a set of March pulleys on it. If you need it let me know. $5 plus shipping and it's yours. Pretty sure it's small enough to fit in a small flat rate USPS box so the shipping would only be $5-6
