new style eaton slave cylinder rt 613

I've got a small box rt 613 in one of my cranes, and the slave cylinder has been acting up. This is the little valve up on the side of the transmission, not the rear.

This is what they gave me at the truck parts, says they don't have the old style any more. According to the paper work with it, I have to get a different plunger pin, and base for the plunger, that goes into the transmission also (neutral pin).
They of course didn't have the pin, or tell me that I needed it to change to...

new style eaton slave cylinder rt 613

new style eaton slave cylinder rt 613