1965 Barracuda MC conversion to Dual Resevior - Push Rod Question

The image you posted looks like the disc/drum mc I just took off my valiant. I'm going to install a 85 fifth Ave mc with the adapter plate and stock push rod. If I can remember ill measure the rod. My problem was no one in town had the rod keeper bushing, not even with new or rebuilt mc so I had to order one (I know it can be made from vacation line but when it comes to brakes I want the correct part). I think you pulled the rod and piston out of you mc when the piston was suppost to stay.