I had to trim my bezel, and I roughed mine out with a coarse dremel bit, then went on and did the fine trimming with one of the tiny bits. Mine was trial and error, and what helped me was to take the bezel off and do it on the workbench with the rest of the assembly in place. It really helps to have the dremel "hose" attachment for precise dremelling. My car is a 2000 Subaru Outback.

Here are pics from my riocar.org gallery:



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Mark Cushman