Using the index in the paper catalog I find Socket, Directional page 99. This yields part number C2558 which is actually the same as the 65-67 Tail lamp sockets. https://ssl.corvair.com/user-cgi/catalo ... ow_page=99
I highly suggest getting their paper catalog. Much easier to negotiate than their online presence. These sockets are available thru local parts houses in plastic and sometimes metal. Many of the plastic ones are cheap crap. Most of the metal ones are pretty good crap. I can not speak for the sockets Clark's sells individually. the sockets that are part of their repro harnesses are excellent. The last time I ordered any individual replacement sockets from they they were the same cheap plastic crap as my local parts store (they were priced about the same anyway), not the same as the ones on their harnesses. Not sure what the are selling individually today. O'reilly auto parts lists a few sockets that would fit 1157 bulbs. Just need to make sure to get one with an outer diameter is compatible so they can plug into the back of the headlamp assembly This size is common as most GM's for a long time used a similar setup.
Corvair guy since 1982. I have personally restored at least 20 Vairs, many of them restored ground up.
Currently working full time repairing Corvairs and restoring old cars.
Located in Snellville, Georgia