For those on a quest for near unobtainable GM options, this one will provide years of searching. During the mid 1950’s, backup lights began to show growing popularity and were occasionally seen on pickup trucks near each rear fender.
The limited production 1955-56 Suburban was no exception but the location for its backup light was unusual. Their single center tailgate running light was given this attachment on its right side. The foot on this small backup light was curved to secure just right to the round tail light housing. The photo below shows this option as it was installed by GM.
Activating the light on a factory column shift three speed or Hydramatic was relatively easy. The switch attaches to the shift linkage levers on the steering column.
The 4-speed transmission backup light switch must be totally different as there is no external linkage. This photo is of this very unusual switch attached to the base of the floor shift lever.