One project done

The new front signals are mounted, and look like this:
I'd mentioned these are aftermarket; they have a threaded stem. I cut the original base off below the cracked portion, drilled it out to take the stem- hole small enough that you screw it in- and used some epoxy to make sure it won't shift. Mounted it in the original hole and ran the wires. I had to cut off the connectors that came on them- larger than the originals- and put the originals on. And they work. I'll leave it sitting till the adhesive cures.

Rear signals worked the same
though I used a different shape on the back.