The previous owner of my 1989 Corvette broke the plastic retaining the shifter boot to the trim plate. These inserts go into the holes in the trim piece with some super glue, then the screws on the shifter boot thread into them to hold the boot in place.

The original fasteners are a weird snap-on type that I couldn't find much about, so I just printed these inserts to just thread the boot directly to the trim plate.

These are designed for a 1989 shifter, however it should work for any manual 1984-1989. Not sure about 1990-1996 due to the interior facelift.

Super simple design (just a cylinder), just wanted to share in case someone else has the same problem