Re: SJ a/c small block
There are two firewall "plugs" that seem to cover knockout holes on the firewall. One is in the very center of the firewall, the other on the far left side left of the a/c hoses -- almost under the hood spring.
Both have a large diameter disk with a center machine screw held in place by an aluminum speed nut.
I cannot find these in the Osborne manual. They don't hold paint well so I wonder if they were intended to be a natural bright finish.
Thoughts?