I just had a correct, original fan clutch restored by Fred Oliva in Florida for my '65 GS. I thought I would post some pictures of it for those that may not have seen a correct original. The aftermarket ones that are readily available fit and function fine, but don't look the same. To that note, I have a barely used aftermarket one that I will be taking off the car that I will make someone a deal on if they need one. It has less than 500 miles on it.
If anyone is interested in having one restored, Fred does an awsome job on them and replates the front cover and knows how to put the proper date and code stampings on them (he got started doing them for Corvettes). Cost is $200 per fan clutch.