[MagicRat]

I remember those!!!!
They were wagons or sedans, but with 6 doors (3 per side) right?
Can you post some pics?

I would suggest to look up clubs or websites for people with commercial cars or commercial chassis.

By "commercial" , I mean cars that were specialized and sold to businesses, instead of the public.
Most commercial cars ended up being hearses, ambulances, limousines and sedan delivery cars.

These clubs would be thrilled to have a member or visitor with an airporter since they were never made in large numbers, and (unlike hearses) they have a low survival rate because they all got driven hard all day long then thrown away when they were worn.

Most of these club members have hearses or ambulances because their (no pun intended) survival rate was high.

Most commercial cars ended up being Cadillacs, with the odd Lincoln or Packard. However, there were commercial Pontiac chassis made for may years. From the early 50's through to the 70's, there were a small but steady stream of Pontiac hearses and ambulances produced.