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They are the OEM alcoa's. As far as what metel the rim is made out of, I cannot tell you. I do know however that the tire shop was very impressed with how lightweight the rim was when they were putting the new tires on. Once again, these are factory rims, I have no changed one thing. The 05-06 GP GXP's had the Alcoa's compared to the newer ones 07-08 having a "offbrand" of sorts.
The GXP also had a staggered wheel setup from the factory as well with 255 in the front and 225's in the rear. This was to help with torque steer. So what are you seeing is correct. The front wheels are actually wider than the rear's! The front rim is also 8" wide and the back's are 7"s wide.
As far as mounting them on you Imp, I really cannot say rather they would fit or not. Maybe another member will chime in.
Another tidbit of info as well. Try www.gmls4.com Many LS4 car owners have since migrated over there and your chances with additional replies will be higher.
Thanks,
Chad













