Tim is correct, these were used in the pre-1951/52 Suburban, panel and possibly the CE. It is a two piece switch, located on the left door. I will check to see if they were with the Clamshell tailgate too, (I think they were) Most of the ones that I have seen were either missing, broken or by-passed. That's probably why they were not available on the later trucks. Save the parts that you have, someone will want them if you don't.
