Here's some info on the U46 light monitoring system fiber optic cables from Ed.
Front fender head light/parking light assembly:
1. Both the front head light cables (left and right) are 16" in length
2. Both the front parking light cables (left and right) are 35" in length
Rear convertible "Cobra Head" tail light/license light assembly:
3. The rear driver side cable is 85" in length
4. The rear passenger side cable is 89" in length
5. The rear license light cable is 115" in length
The front cables are approx 1/8" in diameter for the head lights and approx 3/32" for the parking lights.
The rear cables are all the same diameter, approx 3/32".
The cables were made by DuPont Company and were polymethyl methacrylate optical fiber (PMMA fiber), also known as Crofon,