I have a set of 20's which i may fit soon, but ive been asked to swap for these.... BOLT PATTERN: 5 X 112MM. FRONT WHEEL: 20 X 9.5" W/ 255/30/ZR20. REAR WHEEL: 20 X 10.5" W/ 305/25/ZR20. I know they wont fit straight off, but how difficult to get them to fit???