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If you can match the grabber, that could be a very different look, I'd love to see a photoshop though. I'd lean towards black before red with your body color though.
Definitely dont do black, they will just blend in with the rims and just look like half you whells are black. I say go for something crazy different like yellow if they make it. You can do that since you have the grabber and I think it would look good. I guess red would look ok also.
I think red looks good like on my car, but I don't think red would look good on GB. First, it's the opposite end of the spectrum and visually it's too distracting. If it was a Kona or dark blue, it would be passable, but I think GB in your case would look good. It would have continuity.