If you go look up calipers for the 2007 (and maybe 2008?), it will ask you which casting number for the caliper. As stated earlier, it had something to do with a retaining clip or something. I'm not sure we ever came up with a definitive answer. In my sourcing, I chose to use 2013 as for part numbers to avoid that whole pile.
From my understanding, 2013 style is one of the casting number options it's asking you when looking at 07/08. According to the chart adriver posted that would be the calipers that use the 1363 pad.
According to 2005 GMC Sierra 1500 on rockauto, both the 1092 pad (and matching calipers) and the 1363 pad (and matching calipers) were used on the 2005 w/ rear drums, in addition to the brakes that were used for those with rear-discs. What a fluster-cluck for guys trying to replace their brakes. 3 different front pad/caliper combinations used on OE Sierra 1500 brakes.
w/ rear disc brakes used 785 pad
w/ rear drum, w/ hydroboost used 1363
w/ rear drum, w/ vacuum booster used 1092
according to what I could find on rockauto by piecing together "bread-crumbs" left in the applications information for multiple pads. Some of them don't differentiate at all... one thing is for sure, if replacing brakes on these you BETTER know what brakes you actually have before ordering the parts or you'll be very disappointed.
I have hydroboost on my yukon so if there is some sort of "mismatch" that doesn't mix well with hydroboost and 1092 pad-style brakes then I lucked out and ordered the right ones.
