Modern master cylinder part#

I have a 69 satellite I just finished installing disc brakes on off an 83 fifth avenue. I also installed the modern master cylinder two bolt conversion adapter plate from Mancini racing. Does anyone know the correct master cylinder I need to pick up from the parts store or have a part number that will work? Any help would be greatly appreciated. Thank you!

Get 1 for a 85 Diplomat, $40 brand new from local parts store.

Awesome that's perfect thank you!

Now we just have to get your prop valve in and plumbed