So I found a cover for the photo sensor on a 1978 Eldorado in near perfect condition. Found out it works on almost every photo sensor mount past the early 70s to i think 81, so I modeled it up in blender and printed me a few tests (one of which I'm running on my 75 eldo), and they seem to work very well so I figure ill post it here in case anyone need one.
(I recommend using TPU filament, and the "Print Version" listed as it keeps it pretty flexible but thick enough to hold its shape well)
https://www.thingiverse.com/thing:6910988 (https://www.thingiverse.com/thing:6910988)
Nice. I remember those covers not being in good shape 30 years ago so I bet they are a lot worse now.
yeah, i have 3 sensors, the one from a recently junked 78 eldo was still in great condition, but the covers on the other 2 were basically disintegrated aside from a few small pieces