Hi
My land rover started as a commercial and I've converted mine, by installing the 60,40 seats, make sure you get the floor bars where the rear seats clip into
Also the rear seat belts fit into a bracket behind the side panels, I had to get mine welded in
It will take a little while to adjust the seats so that they lift up and then click down properly into the floor bars
I also put side windows and all the rear side panels etc
Takes a while to do but just take your time to get them set up correctly
If you get atuck there are plenty of people who have done this and will always help
Hope you get on ok , I managed to get a complete interior, seats etc the lot for 500 this was a couple of years ago
One thing is if you take the seats out yourself make sure you pick up every bolt etc that you can
Gary