Rivnut or nut plate? The mod drawing calls for nut plates although I can see why rivnuts would have been used.Jim's announcement in the first post mentions that he's including the hardware necessary to switch over to the rivnut system as designed by Commander Aircraft (CAC). So, if you've already done that then you'll just have extra hardware. You should have no concerns about using the existing rivnut that is installed on the cover plate.
Rivnut or nut plate? The mod drawing calls for nut plates although I can see why rivnuts would have been used.