Ok so bear with me on this I was brainstorming and wanted to throw some ideas out there.
Instead of making 2 end caps I was thinking of adding a section in the middle.
Here is what I came up with:
I pushed the dash all the way to the driver's side and lined up the steering column mounting on the 64-66 dash.

I will mount the door and check it for sure but I am pretty sure the door seal and door panel will fill the gap
I will cut on the tape line, shift the passenger side over to the door and add in a filler piece

I also plan to fill in the radio and ash tray area and also the speaker vent on the top.
Am I crazy or .........