DrewP, my sway bar came with the same triangular brackets, which I have installed. The problem is with the other end of the sway bar, where it mounts to the front cross member. The GMC cross member drops down in the middle because the GMC engines are longer.
http://oldgmctrucks.infopop.cc/eve/forums/a/tpc/f/633004236/m/19120719073?r=33220629073#33220629073 You'll have to scroll to the top.
I'm surprised CPP and others don't offer a 'GMC mounting kit'.
