Gas tanks clamp id ??

[wrndln]

I have a couple gas tank clamps that I don't know what they fit. I am pasting in two pictures of them below. I have quite a few 28/29 gas tank clamps and these are similar, but a little longer and a slightly different shape. I know they are not the two piece 30/31 gas tank clamps. I think they are model A clamps, but not really sure. I would appreciate if someone that knows what they are used on could post a response.
Rusty Nelson