I must have missed what car it is I look back and kind of tried to back read on it, but I didn't see anything, anyway on the Duster, I have super stock Springs (I'm running 295 50 15 )I took a framing square, and I would have been able to fit the 275 60s with no problem (Well I used a tape measure also), I reckon I don't have a whole lot of advice on this.... this spring inboard kits are kind of inexpensive, but you kind of have to know how to set them up, and then you got a little bit of welding to do... I dig what you're saying on the fender lip so what are you saying change the offset on the rim slightly a half inch w/ a spacer? Just spitballing here man....