T-rav:
I have had mixed results with the aftermarket reproduction front fenders for the '60-'66 Chevy trucks, same with the aftermarket reproduction inner fenders. Regardless of the truck retailer, I believe they all come from the same supplier, however Goodmark Industries does sell aftermarket inner & outer fenders for the '60-'66 Chevy trucks that carry the GM label. I have not bought from Goodmark, however I have heard good feedback about them and I think they are superior in fit, finish & overall quality. Good luck with your '64 C10.