I've seen multiple comments about the rarity and expense of the "correct" parts for the 67 GT500 (correct fan and fan clutch being good examples) and while I'd like nothing more than to have all the correct parts on my tribute car, I'd be quite satisfied with substitute parts that have the correct appearance and function and are more available and affordable leaving the other parts for the guys that are trying to maintain or restore an original car. Having said that, I'm currently trying to chase down the fan, clutch, and water pump pulley arrangement for a 428 with AC and PS. First question is what are the part numbers for the "correct" parts and second question is are there substitute parts that would provide the correct appearance and function for these three items.