Thank you, Ok, interesting twist. Maybe I need to look at that solution. Any thread you created or used? This may be the solution.
I’ve never done a build thread or, sad to say, any picture documentation in which I now deeply regret…this I did on my first FJ40 back in the late 80’s and will do on my second 40 once I get it home - it took me many years in Chevy off road ownership before coming back to my first 4WD love of Land Cruisers.
It was a fairly simple modification though - I welded two sections of steel flat stock together, one on top of the other, to give enough meat for bolt holes and threaded holes to be added ( each piece of stock was a 1/2” thick, 2” wide and however long was needed ) and a fixed it between the seats slider rails and floor supports on each side.
I relocated the mounting position of the slider rails as far back as the seat would physically allow and still be practical with regards to my calves touching the foremost seat supports ( but that never really became an issue ).
I counter sunk the the flat stock bolt holes that were used to attach to the seat supports so they would not interfere with the position and movement of the sliding rails and just reused the stock hardware to attach the rails, in their new position, in holes that were tapped in the flat stock ( this is why I made it an 1” thick so that I would have enough depth for the bolt holes and threads - it also gave an additional inch in seat height too ).
It was simple and could be returned back to OEM if ever desired to do so.
I no longer had as much forward seat movement but that never was an issue - not even with shorter leg drivers on occasion.
Hope this helps ya out, Tom
