The part number I got was the 7.3 part #25956245U which as stated above is for Chevy Envoy, Colorado, Canyon, Ranier, Rendezvous, Tahoe, Suburban, Avalanche, Silverado, GMC sierra, Yukon, Hummer H2, H3, Trailblazer and possibly other GM vehicles.
I got mine in the mail and paid the $200 for it... but... I have successfully made a fully working back up copy!
It wasnt easy but I did it... anyone interested in how?
PM me.