I could see the rear fiber optic indicator in one of the photos, however it was not available by itself, U46 Vigilight fiberoptic light monitoring is rare and rarely seen, less than 1500 cars out of 240,000. If the U46 parking lamps are there (provision in the housing for the cable) the possibility exists that it was original to the car, however the fender indicators are missing, which leads one to believe there are more missing parts.
Here is the fender monitor on Dave Beem's L78 conv... along with the window sticker...
Without Factory Paper it would be difficult to determine if a car left the factory so equipped.