3 on the tree to 3 on the floor conversion

Merry Christmas Fabo! I'm converting my 70 dart over to floor shift from 3 on the tree and have a quick question. I have already picked up the shifter with the rods and levers I need, but I am still lacking the mounting plate and hardware to bolt on to the tail shaft to mount the shifter to. Is this piece 3 speed only, or is it the same mounting plate used on 4 speeds? Any insight is greatly appreciated! And if you happen to have what I need please let me know!