[FireSale]

Be sure whatever you settle on fits the case year you have. There are several different modular ports on C4s. 65-72 are threaded and 72-73 are push-in. Mostly.

When I started in 2013 I bought a complete TCI Streetfighter C4 with a manual reverse transbrake valve body. It came with a stock VB installed and the reverse/TB unit in a separate box. The solenoid was push in and the case was threaded. Wound up buying a 1972 case and putting all of the innerds of the TCI in it.
There is an ID number on the side of the trans. Put it in a Web search and see what you have.
I have Broader parts in my C4 302 bracket Mustang. They make good stuff in a barn in Texas.