Originally Posted by maxcichon
I'm sorry, but I think your research is in error. The Stern ST-1's come with a true Mercedes fitment -5 X 112, 66.56 mm center bore. When I bought them, Elites-Wholesale.com listed them as having a 73.1 mm (BMW) center bore. I even bought the poly fiber centering rings at the same time anticipating this issue. All for naught as it turned out. I also bought the Mercedes fitment hub-centric spacers to sandwich this all together. Those were the only bits I needed. And they have, as I said, a very nice, snug fit to the ID of the wheels. And a nice snug fit over the hub on the car.
Please don't take this response the wrong way!
I'm a machinist and have been building machinery for 30 years.
Keep thinkin'!
I'm at a loss. I just wish someone else could drive my car for 5 minutes. They would probably say "It's this, idiot!"
Re-reading my response I understand now. Your right the INSIDE diameter is a mercedes fit. The OUTSIDE diameter is what I was stuck on.
Back to the drawing board...