It fits a lot of GM cars/engines, Cadillac Northstar is one. It also fits the 3.7 liter in-line 5 cylinder in the GMC Canyon/Chevrolet Colorado twins. For a complete listing try www.acdelco.com.
I know for a fact that it fits 1/2 ton 2002 Chevy Suburbans w/5.3L (325 cid) gas engines which are flex-fuel (E85) compatable. I suspect they would also fit the same year Tahoe and Yukon/XT, as well...