Screw size
Race Director
Joined: Jul 2015
Posts: 13,082
Likes: 3,399
From: SW Florida.
10-24 are bumper cover mount screws. GM wasn't real big on fine threads except flywheels, balancers and stuff. phone cameras are pretty good. try to get a pic of female thread. you sure it is a machine and not sheet metal thread?
Race Director
Joined: Oct 2000
Posts: 12,624
Likes: 3,097
From: Shamong, NJ
The original driver's side mirror mount screw was a special 10-24 screw, with a #8 head, but any 10-24 machine screw with a countersunk head should work. The same screws were used for the rocker panels.
10-32's were used with the Well Nuts, used to install the passenger side mirrors.
10-32's were used with the Well Nuts, used to install the passenger side mirrors.
Last edited by gbvette62; Sep 24, 2019 at 08:39 PM.
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Thread Starter
Melting Slicks
Joined: May 2006
Posts: 2,364
Likes: 103
From: Centerville Louisiana
Ok guys this is how it turned out I ran a 10 24 tap in front hole but it was to big for the second. They had a sheet metal screw holding it on with probably some kind of glue. I was able to run a 8 32 tap in and same size machine screw. I didn’t’ Want to get the drill around the fresh paint if possible. Thanks to all who replied.