Slim,
I did some more research last night on this for you. (Normally I leave this sort of stuff to Ken, who can prob recite it from memory.)
OK. Chapter and verse according to the Illustrated FE Parts Catalogue:
SWITCH ASSEMBLY RING | FE-225 | 7405916 |
SCREW Fillester hd.sl.mach.No 8-32 x 7/16" | FE-225 | 131966 |
WASHER Spring lock No 8 medium | FE-225 | 121841 |
| | |
CONTACT SUPPORT SPACER | FE-215,FE-217 | 7405913 |
SCREW Rd.hd.sl. machine No. 6-40 x 1" support to spacer | FE-215,FE-217 | 421885 |
WASHER Spring lock No. 6 medium | FE-215,FE-217 | 131044 |
So long story short, the contact support spacer is the blank for the indicator switch assembly.
Note that the catalogue only refers to the three sedans because it was released in 1956, prior to the introduction of the other body styles. And as Mick says, they were called park light assemblies because that was their function, but they doubled as indicators. In contrast the FE had the parkers in the headlights themselves, so the indicator bodies were only fitted to cars that had indicators!
Hope that helps,
RET