This weekend I was able to patch the hack job the previous owner did on trans tunnel so they could have a Hurst floor shifter. The old Hurst instructions show someone using a chisel to "cut" the sheet metal opening. I think that must be how they did it.
I cut a filler plate out and made the opening as small as I could while still being able to sneak it around all the linkage and the reverse light switch.
I still wanted to reduce the size of the opening to try to eliminate engine odors from the cab, so I made a "grommet" out of some commercial garage door sweeper rubber and then made a trim ring to attach it to the plate. The rubber is reinforced and can deflect where the linkage makes light contact on it.
I think it turned out nice for something that will be hidden from sight. I installed the Hurst cover over this. There is a big reduction of cold air entering from here now and a noticeable improvement on engine odors.