Here's some headliner retainer clip part numbers from my late 90's parts book.Not sure if it will help.Hopefully some of these part numbers are good or you'll possibly use these to find a superceded newer #. Jim
Can't help with part numbers, but check other model cars while in the junkyard. I grabbed a few gray ones from a RM just to have a spare set, but pretty sure other cars use these too.
If you just need Black, then just go to NAPA and get a couple that they use for hood insulation pads. They may even have these for other purposes. They have a bigger head and are just a standard push pin on the other side. If that does not work for you, just get any color from a B or D body car and cover them with the same material.
Edit - something like this may work....but doubt you need 100