[83hurstguy]

No prob. 402995 (more details in that thread). They were still available NOS a few months ago, or a wanted ad on classicolds should get you more of an original/patina nice one if you are going for the unrestored look. Should be easy to get one.

There's a generic HD Delco fan clutch for later Olds 307 that should bolt on and keep it cool as well if your original is toast. I don't have the p/n handy at the moment... It's not a perfect original, but with a shroud, you can't see the clutch anyways... My 68 has the original OS clutch in good shape, I may switch to the new HD one so it stays cool. Haven't decided yet...