Caroline,
Thanks, your lists show mine to be a 1955 vintage. I thought it was older, but I don't mind.
What I'm looking for as far the measurements go is from the top of the foot where it clamps onto the shaft to the bottom surface.
Then from where the top bends down to where the needle passes through the foot.
Also is the cut out on the clamp part off set with where the needle passes through the foot, or in line with it?
I think that should do it.
Joe