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This is indeed a thing, and the reasons are just as Jim Gilbert explains.

Coincidentally, I've just had the repairs done to my car, after 50K miles of neglecting the problem. The damage was extensive, and a lot of it was hidden under the black paint. Small cracks were radiating from all the holes, with much larger ones in several places. The fix involved welding wide strips (like Gordon describes) across the pans at both the front and rear pairs of holes. To do that, you've got to grind away all the carpet adhesive first to get down to bare, clean metal, so there were many hours of work involved.

It takes a few years for the first cracks to show up. Again, this is not a result of corrosion, but metal fatigue. The floors were never designed to withstand the point source loading that results if you just bolt the seats directly to them.

If you're installing fender washers, put them on the inside, too, and try to use the wider, 3-inch ones. My car was originally delivered with 2-inch washers on the outside only, and they did nothing to prevent the problem.

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Last edited by Sacto Mitch

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