Question about mounts

Bill Whelan put this question to me:

Well, I don’t have a professional opinion, not being a professional! But someone here might. Have any advice for Bill? Pix are below.

Dan

what leads you to think they are 59 Plymouth parts?
are there parts #s on the items?

Those there appear to be some nice rubber inserts that the can mounts on the 318 poly fit over. The bolt is skewed to one side so you can turn it to ensure there is no pressure. Easy way for minor adjustments.

Excellent identification..I completely agree with your ID..