Fiero Window Regulator Roller

Replacement window regulator roller
It can press onto the existing metal nubs. A C-Clamp works well for this
Do not print this in PLA, it will likely melt.
ABS can work, but I had one deform after a while
Polycarbonate might be good, I'm trying one now
Nylon would probably be best. I haven't tested it yet though.
You should probably spray in some Lithium grease to keep things rolling smooth.
The inner area is hollowed as a sphere of approximately the same dimensions as the metal nub.
The bottom hole is slightly larger, press this bottom-first onto the metal nub.