Shop Shark,
I don't have a picture, but I'll try to describe it better. The little pushrods that have a fork on them...that slip over the brake shoe and the other end goes into a little dished-out area of the wheel cylinder's piston. Follow where I am this time? That dished out area that the pushrod goes into is the area I am talking about. Two of my pistons dished out places are smooth to the edge of the piston's diameter, while two go up to a little 1/8" shoulder around the edge of the piston. Just can't think of a reason why it would make a difference...