[TheJDMan]

I can't offer any advice on the fronts, you probably need to contact Ridetech about that. However, I can tell you a bit about the the rear end width. I have 18x12 5.6"bs wheels with a rear end width of 57" wms to wms and rolled fender lips. Based on my experience, a 5.75" back space would be a slightly better fit in the wheel well with the 57" rear. But since you already have the 18x12 5.5" bs wheels I would recommend a 56.5" rear end width. But don't take my word for it, you need to mock your wheels up under your car and verify what fits your body. Also, since you are buying a new rear anyway, please take the time to at least look into a full floating hub style rear end because there is little to no difference in price between floater and non-floater.

BTW, PM me before you order the G-Link and I can give you some advice that will save you money and frustration with that suspension.