New Moog sway bar bushings didn't fit the existing brackets. PO put in an aftermarket bar. Not sure if it's a Dorman or GMPP or...
Bushings appear to be in good shape. Back poly, not rubber. Not a thick as the Moogs. Split on sides for install.
Cleaned everything up and lubed the bushings & brackets before install. That annoying "creaking" sound is finally gone.