If you have an R, you will most likely want the Wide. I have a 4 seater X with aftermarket offset wheels and 1 1/2" wheel spacers, and I have the wide Mud Busters. They just cover my front tires. I 'm glad I got the wide as opposed to the standards. I was always clobbered with stones until I got these. The rears are the same for both the wide and standard. I hope this helps !!Mud Busters - Standard or Large for the R? Does anyone know the width difference in the standard or large?