64 Dart GT manual conversion

Does anybody know if I can use any year a-body floor hump for my 3-speed on the floor conversion from a pushbutton? The shifter is an aftermarket retro-fit shifter (Roger Fenton 300) that mounts to the side of the transmission tunnel, not the transmission. The tranny does not have any mounts for the shifter because it was from a three-on-the-tree car. I just think that I need something to cover the shifter and linkage ( 2"x 8" slot in tunnel for the shifter rods) and keep the puddles from getting my feet wet.