Parts Cross-Reference Resources?
 

Hi All,
Are there any websites, by maker or in general to cross reference the model applications of auto parts? I guess what I'm looking for is an online parts manual by model or maker.

If there is none, does anyone have any good sources (besides ebay) for physical parts manuals/CD ROMs (especially factory references)?

Note: I checked here on PeachParts first but found nothing similar available.
Please let me know if I just failed to find it!

Thanks Yak! I'll check into this one.