You will mostly likely have to do a custom bracket, especially if you are using a 40/20/40 because the stock bracket is one piece and bolts to the seat on the other end, there in turn would not be spots for all the mounts. Also if you use a seat with incorporated seat belts (belts are attached to seat) if you do not have a death wish, you will want to reinforce the floor where the seats bolt down. Our floors were not made to have that kind of of strength for when you get into an accident that it would not bend or buckle and you would be through the dash.
I know the seat I choose for my one project is a seat out of an early 90s ford (yes I know I should be struck down....lol) because it was a one piece bench with a center arm rest that folded up and down and it had high back (I'm 6'2" so it may actually stop my head from going through back window). Because it was a solid bench all I had to do is switch the ford brackets for Chevy ones off my old seat. I have not put it in yet but I think the holes in the floor ill line up too (same size seat) if not I just have to move the bolts in the floor which is super easy.
If you do not mind building brackets, then the early 90s Chevy (as long as it did not have the trick 3rd door) would work. The seats belts are not in the seat and they were a 40/60 split so you could move the driver seat separate from the passenger (some were even power driver).