So where can I find the fixture to hold a 4r70W for a rebuild?

[1996BLKBauer]

So I am going to be rebuilding a 4r70W, but I am looking to get the fixture that holds the transmission onto the bench, basically the piece of metal that looks like a "C" that supports the transmission. So does anybody have a part number, and or a link to one I can buy? I also know there is one special tool I need that basically holds a bunch of clutch packs together when reassembling the trans, does anybody know what that is?

 

[1996BLKBauer]

So does anybody know what I am talking about? I feel like I am using the wrong terminology, but For the life of me cannot think of what it is actually called. I would really like to know so that I can order the tools needed to rebuild this beast.