If it were me I would go with these
http://customwheel.com/custom_wheels...0142%20143.jpg
Wrapped in these
http://www.mickeythompsontires.com/i...s/baja_atz.jpg
The GMC will have a 8 x 6.5 lug pattern. The GM lug pattern is the same on the Chevy & GMC but different from the Ford.