2002 Jeep Liberty Underdrive/overdrive reaction plate

I am rebuilding my Jeep Liberty Transmission. My friend who is helping me is a professional mechanic but does not speak very good english.

We are finished except for one item that is broken that I cannot find anywhere. It is a clutch underdrive/overdrive reaction plate. My friend says that is the proper name and showed me a schematic printout from the jeep repair guide.

However, I cannot find a parts dealer anywhere who knows what it is or how I can get a spare one. I cannot find a part number for it and need this piece asap.

Is there anyone who can help me out here?

Thanks!

Tim