SRV diagram
Guitargeek.com's diagram of SRV's setup.
Custom shop signature strat
This is a SRV signature strat. They come stock with a black pickguard with "SRV" engraved on it, in the same place he put his SRV decals on his strat. This one is owned by Greg Morlan of Jag-Stang.com. Stevie Ray's strat had a left-handed vibrato unit (to emulate Hendrix) and it was a '59 body with a '62 neck. Before he changed it to a black pickguard, it had a white pickguard like this one. The signature model has Texas Special single coils (designed for the guitar) and a pao ferro fingerboard. It also has gold hardware, which SRV's did not.
Stevie's #1
This is the actual strat. Stevie's #1. While he had some other strats, most were just stock vintage, except for 'butter', an all white model with lipstick pickups.