no, they are 114.3mm, or 4.5" bolt pattern as most FWD GM cars
the G-Bodys have 120.7mm or 4.75" bolt pattern, which can be found on many old mid-size GMs, and some small trucks. Best bet is to find some rims off an A or F body, or a vette, or an S10 truck. You may also try some 120.0mm BMW rims.