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Could you, and get away with it? Maybe.
If it were my, I wouldn't. You could end up losing all your fluid if a seal breaks, and then it would be rather difficult to stop.
If it were me, I'd just run down a junkyard and find one of the little pushrods/pistons.
Ok, I'm now 99.99% sure after looking at your pics. In your pic, the rod/piston should be where the blue line is in the red circle. It pushes against the shoe. In the other pic I found, it just kind of gives you an idea of what it should look like. It looks like a bolt with a notched oval head.