I recently bought OEM '03 Cobra Rims without test fitting and gathered some useful info for future reference. No you cannot use centercap, no it doesn't seat perfectly flat and good luck with tire not hitting upper control arm. Our front spindles/brake are like the rangers in the fact you will have to use a spacer and hammer to fit wheel and center cap. I believe the spacer will fix the seating problem since the spacer's center hole is bigger than the rims center. With the 9" width it doesn't seem to push the wheel out past the fender but puts the tire real close to the upper control arm (offset). I haven't decided yet but look as though I will be running a 1" spacer that bolts to spindle/brake and then wheel bolts to that (x2 tightening). This will allow me one solution to fix all the above problems, but then my truck might be widetrack! I don't know if the 3/4" spacer with longer studs would fit? If the front sticks out to much I will have to match the rear with equal spacers. Mine is a late '97 and I don't think there is a huge difference between the '98. By the way I will be running a 275/55/r17 General tire and not the factory Cobra F1's. Will be able to test fit with tires in a week or so.