Not the door panel screws, but what they screw into

[AJLChase]

I just purchased some new door panels for my 67 and it's been awhile since I had taken off the old stock door panels. I didn't realize there were clips with threads within the door where the door panel "screws"are screwed in. I seem to be missing a few of these clips and won't be able to install the panels until I replace them. Any vendors that sell these? I've checked Brothers,GMCPauls and LMC and didn't come acrossed any.

Thanks!