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I think you use a tool like this one.
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That is the right tool, and my local Menards has them for something like 10 or 15 bucks, with 4 different sizes of the threaded rivets included (including the right size for the side mirrors). It's a Menards brand tool, so I would think any Menards would have them. It was in the same section as the pop riveters. I should still have the packaging if you want the part number.

1974 'Cuda 360/TKO 1990 Ram Van 1998 Neon