Here is my quick start to a list of web sites that offer custom aftermarket parts for our cars. Most folks are probably familiar with at least one of these. I am guessing there are lots of 3D printed parts out there that I am not aware of. This could be a place to review some of the stuff these folks sell. Add more links if you can. Thanks.
Restotuner
Octoclassic
EFParts
Tegiwa
CRXOnly - Source for CRX Climate controls
Naytontech
GregParts LLC
Pupop (on eBay) - Source for ICUs
Hush performance
FF Motion
Project EKP

 

Do not buy from EFParts. He scammed me out of a $350 wiring harness, and some cluster LED's. Doesn't answer phone calls, doesn't answer emails.

 

This should be a Sticky

 

Here is another one someone mentioned to me this morning at a "Cars & Coffee" event

Power Rev Racing

 

OctoClassic has added a few new items including 37752-SH2-A01ZC