When i had to put my shifter in my floor from when i changed if from an auto to a manual there was already a hole for the shifter, but there was a plate that i had to remove, 4 screws, and i had to get a plate from the junk yard that had a hole in if for a shift, now i don't think this hole was big enough for the shifter and linkage for the manual case, you might have to, well i know you will have to buy that metal piece that bolts to the floor board and then rip your carpet up and see if there is a hole like i had in mine. I might use the same hole, just a different plate to bolt up too. I'll be anxious to see what you find out.
Happy trails!!