Technical 1961 Fury taillights help with screws

I am planning on using theses taillights on my current project but I a missing the screws that hold the plastic lens on. They screw on from the back through the piece with the wire on. They are some kind of different thread that I know what they look like but can't seem to identify what they are called. Please help so I can get the correct screws. Joe

 

That's a '62 Imperial tail light, not '61 Plymouth.

 

Probably some common style machine screw. My car has Phillips oval head 10-32 screws all over the place. I get stainless steel ones from Home Depot.

 

Might try here...
https://taillightking.com/60-69Chrysler.htm

 

Yep, I'm sure it's a common thread size, either a 10/32 or 10/24, maybe an 8/32. One issue with these is the OEMs sometimes used oddball 'purpose built' screws on these, usually with a shoulder to prevent breaking the lens from overtightening. No help on these except for trying find OEM replacements or finding some small tubing to mimic the shoulder. You'll run into oddball lengths too, look at that.

 

If you can eyeball the hole where the screws go and judge that they are in good condition, you should be able to go to a Fastenal or other seller's outlet and match screws to the thread.
Check the depth of the thread with a matchstick and add the thickness of the lens to figure out how long the screws need to be.

EDIT: Usually there is a weatherproof seal of some type between the lens and the pot metal piece. This can add a hair to your screw length.

 

I bought several size wood screws and the only thing that works is a number 8 but they only screw in half way. I think that will work but I was hoping to find the original. Maybe at Hershey.

 

Squablow identified these as 62 Imperial. When I bought them I was told they were Polara. Then I looked around and the only thing close was the 61 Plymouth. Now I am the owner of Imperial taillights!

 

Wood screws have kind of a tapered thread, that might be why they only go in halfway. Look at sheet metal screws, they will have a course thread like the wood screws but not tapered.

 

Oval head trim screws (not wood nor sheet metal) are what I would use, similar to these from a 1960 Imperial: