Pivot lock shoe
A quick learner from Buffalo Grove, IL says:
September 28, 2014
The pictures I have attached looks like your item no 15-152. The measurements are about 1 1/4" wide, about 2" long and about 5/8" deep.
Paul from SWISCO responded:
October 1, 2014
Looking at your pictures, and based on your dimensions, I think you may also want to see our 15-129. This may be a better match.