Z71 Tahoe Rear Springs - Years?

[Majoraslayer]

This has probably been asked before, but for the life of me I can't find it. I'm going to call around at the scrap yards tomorrow, and I'm not sure which Tahoe model years I should look at as a donor vehicle to do a rear spring swap in my 2003 Trailblazer EXT. At the moment I'm working on installing a BDS 2" lift, and this seems like the perfect time to install the stiffer rear springs to improve my towing capacity. For some reason I just can't find the Tahoe model years I need to look at anywhere.

[TBYODA]

Did you use the new part number in your Google search?

Avalanche/Tahoe/Suburban Z71 Springs - GM Part #15234633 or #25978750
viewtopic.php?f=15&t=20#p19425