1971 Datsun 521 wedge bulb and socket on left, 1966 Datsun 520 round bulb and socket on right,
https://www.flickr.com/photos/53116286@N07/15295097484/in/photostream/
https://www.flickr.com/photos/53116286@N07/15295097284/in/photostream/
I have not been able to locate a source for the round socket. Was this used on the Datsun 320 to 410?
Thanks,
Keith