I have a few questions about these wheels. I recently picked up a like new wheel and the previous owner did not know if it was off a F4 or F4i and I was wondering if anyone knows if there are any visual clues on the wheels casting that might tell which generation it's from. Does anyone know if either F4 or F4i wheel will work on a 5th gen? I think I would have to buy the appropriate wheel spacers to get it to work? I had read that the F4i wheel is much lighter than both the stock VFR wheel and the F4. I was going to weigh it tonight with the wheel on and see. If anyone has any insight on this then I would really appreciate it.