What have people done for an aftermarket rear seat that will fit 3 people (carseats for now)? Recently picked up a new to me 85 4Runner after rolling my previous SAS'd 87 4Runner. The mounts for the stock seat will not work. Anyone have any suggestions?

 

What's wrong with the stock seat?

 

With the way the cage is done, the front mounts for the seats is completely blocked. The upper mount, where the release to fold down, is also not there anymore.

 

Skinnier passengers of course! You could fit three 80's ladies in there back in the day no problem.

You're trying to mount three carseats side by side?

To a large extent they won't be needing the floor space so you can add a tub across the rear wheel wells that the original seat sits between iirc.

Since you have a custom internal roll cage I'm willing to say what ever you find for a solution is going to be a one off and require some.creative fab work.