[KTL]

While you're replacing the screw, I would strongly suggest "re-threading" the bottom tab to have more threads. The original design of that dimpled steel tab with like 2 threads in it is the suck. Try putting a nut-sert in there to establish a better receiving thread depth? I believe the thread size is M5 x 0.80 pitch. I have one headlight on my '87 that is stripped out on that tab and it's really annoying.

A simpler/crude solution is to ditch the machine screw threads and use a self tapping screw of a bit larger size to capture the hole better and cut some new threads.

Regarding the trim ring, his light will still be properly secured in the headlight bucket with either screw. Just because he's got the headlights installed w/out the trim rings doesn't create a problem. I have the same installation on my '87. My lens rings are black (his are chrome) and I just painted mine red instead of using the pesky, expensive trim ring.