I was replacing my driver's side low beam and the screw dropped into the fascia. I went to get a magnet and probably shook the car a little bit, and when I went back up front, the screw had disappeared from sight in the little drop space beneath the bulb. can anyone tell me the size for the T10 or T15 size retaining screws for the headlamps on a 1997 z-28? and where to get replacements? I went by O'Reilly's because they were closer than any Autozone, only to realize that they were complete morons. they didn't even know what I was talking about. looks like T10, 3/4" length, 1/16th" root diameter?

appreciate the help

 

You can pull one out of the other light and take it down to Lowe's or home depot.
I think Lowe's might have them I'm not 100%.
In any case they have a place that you can thread the bolt in and find out what size it is.

 

well, looks like I can answer my own question.
#6 5/8" blunted metal screw. If y'all say they're T15 (I think per the upgrade instructions in other posts), I'll take your word for it, but I could only get a T10 into mine because of either the oxide coating or they just had corrosion in the heads. I got a quick replacement from Home Depot with a Philips head and pointed tip, but if I want to save any future mechanics some knuckle slices, I'll have to file them down or go look for better ones in the future.