Does anyone know where to get retractable seat belt kits for a 67? No one seems to carry them.

you can get a universal kit. That is what I am doing for my 66. I forget the website I looked at but a google search will solve that problem. Also there is a sponser for the site I think the name is "Retrobelt". If you just want seat belts this would be the easiest solution

Got mine from a 68 Buick Skylark

read the post partway down from here about 3point belts for a 66. in there is place that has them www.morrisclasicconcepts

We have seat belts that will bolt into GM cars .Morris Classic Concepts seat belts are year and car specific. The 66-67 Nova seat belts are the same. The seat belt assemblies are delivered ready to bolt in ,about 30 minutes. Nothing to assemble just bolt them in. We use all of the factory mounting bolt locations for safety as GM tested the the seat belts attached to those points.
morrisclassicconcepts.com Billy

I have had Nova's on my mind. I see you are looking for Chevelle seat belts as this is a Chevelle site,ha ha, Getting late for me I guess. Anyway the same applies for Chevelles year and car specific, ready to bolt in. Billy