WTB - fibre optic cable for fender light monitors for 74 LeSabre

[74455]

I have a 74 LeSabre convertible, with the fender light monitors. Thanks to knowledgeable folks on the technical thread from last summer, I now understand how these work. A mechanic and I went over this, and found most of the 6 cables (one for low beams, high beams, turn signals on each side), are broken, one is missing. Only one is hooked up and still transmits light to the fender monitors. So I need the fibre optic cables, maybe from a parts car? GM made these at least until the late 80s (I saw a '88 Estate Wagon on eBay with them). If anyone has B or C body car with these working, or that you've fixed, I'd love to hear about it, or any ideas dea of something that will work. I am determined to get these things working again!! Thank you.