That's not what he's talking about. That's the stock 72 kickdown switch. Earlier stock switches were mounted on the carburetor.
He's talking about the aftermarket lokar switch I outline in this post:
http://67-72chevytrucks.com/vboard/s...d.php3?t=70874
I can go out and look at mine in a few minutes...
You want to know what size the bolt head is that fits inside the plastic piece? I think that's what you mean...