Doug: Didn't get Pantera seats with car
Otherwise would be having a different conversation, like where to get new foam and covers...... 
Other local club members who have done this swap are really pleased with them. I've sat in them and they are comfy. Long term.....we'll see!
tberg: The Vette "kit" came with aprox 1-1.25" spacers at the front to allow floor to clear that drop in the front where the seat cover clips to on the Vette Seats. I added two thick washers on each side in the back in addition just because it felt like there was a gap.....you could force everything tight.....and bend it a bit......but that didn't seem good.....or right.....
I'm feeling like if I can get the seats in, they should slide really nice on the Pantera seat tracks!
Steve: I like your work!!!! Why the 1/2" + protrusion is sorta odd.....I'm sure I'll understand why when I pop that off to take a look....probably has to do with the boot!
I can probably spray paint an old sweat sock black and slip it over the whole thing, never know it was there......
Actually I may have an old leather shifter boot from a 'Bird or something that may suffice as a nice looking cover!Next! Look at the hump relocation.......for the engine cover.
Grazi!!!
Steve