I had an issue with my left brake light not working, upon inspection I found that the contact had gotten hot and melted/burned the plastic plate that holds the contacts.
I was able to remove the plate and measure it to design a model. I 3D printed the plate and used new contacts from a universal socket (Dorman 85860) to get the lights working again. I uploaded the model file to Thingiverse in case anyone else runs into this issue.
www.thingiverse.com
I would recommend using something like a resin printer or maybe a high temp FDM, because I don't know how hot the bulb gets. I'm going to LED so I don't think it'll be an issue either way.
I was able to remove the plate and measure it to design a model. I 3D printed the plate and used new contacts from a universal socket (Dorman 85860) to get the lights working again. I uploaded the model file to Thingiverse in case anyone else runs into this issue.

Isuzu Trooper brake/tail light contact plate by ArizonaZ
This is a replacement contact plate for the 1157 bulb in the brake/running light socket of a first gen Isuzu trooper. I used a Dorman universal socket (85860) for new contacts, and spliced them in to the wire harness.

I would recommend using something like a resin printer or maybe a high temp FDM, because I don't know how hot the bulb gets. I'm going to LED so I don't think it'll be an issue either way.