OK, back to van stuff. Seats, specifically. This took a bit longer than I expected, I had to modify or fabricate every part to make them work.
How to make these seats and swivel bases, from a 1980 E150 fit into a 2004.
Well, first the mounting holes are quite a was off between the two.
I used some angle iron to make some extension legs and redrilled some holes for the rear bolts.
That seems like it will work OK. A bunch of cutting, grinding, and drilling, a little paint and they're in.
Now what about the seat belts? There is no easy or clean way I could think of to retrofit the tensioner assemblies from the 2004 seat to the custom seats without butchering the upholstery or mounting them externally. I pulled some rear seatbelt receptacles from a 98 E150, they are different and won't work. After rummaging about for quite a while, staring at the interwebs till I had a headache, I decided to wing it.
I looked through all the vehicles I have around, even including my tractor and suzuki samurai and found that the second row seats of a 2004 suburban have a receptacle that may work.
I built some little brackets to attach the receptacle to the seat base...
No pictures of them painted, but I'll get some when I get a couple receptacles installed.
I did figure out that if you happen to loan this van to someone 7' tall, you can install the seats with the swivel backwards and get tons of legroom.
After I removed and reinstalled the drivers seat, This is what I was left with.