OK, it seems there can be a larger grease cap on the drivers side. Since I was only test fitting my Audi wheels on that side I assumed I had to do at least 2 rims that size. I'm either going to look for the smaller cap or cut this one down. Now, as for grinding down the rims at home, there is only a small lip that needs to ground off for the rims to fit. I was using grinding stones in my drill and my Dremel. On both the stones load up quickly and clog with aluminum. A round file was slow going too. Today I discovered that a heavy duty cutting wheel on the Dremel makes quick work of the lip. What took 2 hours on one rim will be about 20 minutes on the next one. Also search Youtube for videos on boring out rims at home using a router. Jeff

Jeff Stewart