Who Knows Correct Screw Size for Tail Light & Reverse Plastic Lenses?

I am ready to install two old tail light lenses (red) and two new repro back-up light lenses (clear with reflector) in the '65 Formula S. The photo shows some leftover broken lenses and a newer back-up lens.

Anyway, so as not to split or crack the lenses with the wrong diameter or wrong length screw, who can help me out or direct me to a thread with some measurements? I am in Mexico and just want to run down to the nut/bolt shop down the street (don't want to involve any mail order madness for just a few fasteners). Thank you.

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