You can find used car parts in Denver at any junk yard, online on craigslist, some auto parts stores also carry used auto parts. You can also bid on them at ebay.
CJ Pony Parts, Andy's Auto Sports, and Partscheap all carry replacement Mustang parts. None of them have store locations, but they do carry a wide variety of parts.
the best diagram will be in a Chilton's book which you can find @ ahy auto parts store
Go to your local NAPA, Advanced Auto Parts, O'Reilly's and buy the Haynes Repair manual specific to your model and year.
You can find parts for the 2000 Ford Mustang online at the official Ford website. There are of course alternatives such as ebay, amazon or the autopartswarehouse website
Any major auto parts chain store, like autozone, or napa will have them.
go to your local auto parts store and buy a haynes manual. In the back they have full wiring diagram.
One can find replacement parts for a Mustang GT 500. You can go to a website called Ford Racing Parts Direct. They offer different types of parts for one's Mustang GT 500.
napa auto parts
you can find the dah and other related Classic Mustang Parts at http://www.aapd.net
you find it
i got a mustang repair manual off advance auto parts online for 79-93 mustangs, has an ok diagram. book costs $27.99