Fixing the door panels on a 95 cutlass supreme

i own a 95 cutlass supreme, and the door panel on both sides is connected to the frame of the car by these white plastic clips that have thread all up them, and they fit very snug into drilled holes in the frame. Well my car is missing many of these on both the driver side and passenger side and closing the doors creates a rattling sound due to these missing clips not holding the panel to the frame. Does anyone know where i could possibly go to purchase more of these or fix this problem?

Thanks

Welcome to AF !

You can purchase those push pins at most auto parts stores.
Not sure what the cost, but they are cheap plastic, so I'd assume they are relativly inexpensive.