My recently acquired '91 has a broken tab on the left top side of the knee bolster. After stumbling onto this thread, I decided to try removing it to see if it can be repaired.
I must say, after jamming my head, flashlight, 10" screw driver and a hammer into that tiny space, I had to recheck NSX Prime to make sure this thread wasn't posted under the "Contortionist Tricks for Near-Sited Horse Jockeys" forum.
I then tried the brute-force/quiet explicative tug method, and after a few tries it popped right out. I'm going to try and fix it with epoxy since the broken piece was still in the clip and upholstery glue to tighten up the fabric that came loose over time.