Firewall plate

[6APPEAL]

What is the thread of the captured nuts in the firewall? I'm replacing the A/C with a firewall plate. TIA
John

 

[Scott Atk]

Don't know the answer, but I was able to re-use all the original bolts with my block off plate from www.buickgn.com

 

[6APPEAL]

When I bought the car it had them all removed, so I don't have them. The previous owner had the same idea, just never got beyond removing the shells. That is the only reason I'm looking for the thread. I would like to replace them with some black button head screws.
John

 

[GNVYUS 1]

If I remember correctly, I got SS #12's.

If you don't get a definite answer just buy one from #14 to #10 and then go back later on for the SS. They were cheap and look great on the plates.

Some of the other smaller sizes were 7mm.