Parts Compatibilty?

Is there anyone out there who can tell me what parts off the Gen 4.5 (2000 - 01) that are compatible with the Gen 4 (1997 - 99)? I've looked though all kinds of parts catalogs online, although they're quite inconclusive. I need someone who has a visual with a Gen 4 and a Gen 4.5 to tell me what all will fit. Any help would be greatly appreciated. Thanks in advance.

-yota