Once you've found the exact center of your hole, make a small cut to mark that point. I then took the grommet and a pencil, outlined the size of the actual hole, then cut with small scissors and a razor blade. This is pretty slow going because you have to cut leather, foam and the undercover. Take your time or you could end up with a huge slash in your cover.

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TClanton
1980 450SL 90K
1980 300SD 112K