16 x 7.5 i believe the B.S. is 5.0 and you are correct on standard gm bolt pattern 6x5.5 but spindle bore is large not sure size
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GREEN no BLING , LINE-X & 35's , Adv. , monsoon & some other crap too 
Hangin with my HOABies , Bling is cool but HOABies RULE!!!!
Black Sheep Hummer Squadron / camp  no due's & no dont's 
* Rollin with the Banned and the Damned *
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