I just finished a nice brake upgrade on my sunfire, it consist of 96 lumina brake rotors, 96 calipers and brackets and pads. I custom made some brackets to fit into the stock housing then the brackets were redrilled and mounted. The brakes fit under a 16" wheel. If you are at all interested I can see about having them made for a GB. Looks like $125 for the brackets or $300 for a set. The set will include the brake caliper bracket redrilled, rotors, mounting bracket, hub rings and bolts. All you would need to buy is the pads and calipers.
http://www.overkillengineeringmotorsports.com/
stock rotors or drilled ones?
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Primer Counts as Custom Paint Right?
BTW: This is my Sig.