I used to have these in one of my GTA's. I bought more of the matching material to retrim the rear seats and the door panel inserts.
You just have to be sure when you fit new seats about the height like Darren said. Some of the flip recliners have high backs so they hit the roof when you flip them forwards. The other thing is some seats have back adjusters on both sides, meaning you have to remove one to get the seat nearer the centre console. Some of the cheaper recliners are quite narrow but you can find you end up sitting on the bolsters.
Fixed buckets are fine, but you have to mounts the seat on the furthest forward point on the frame, so you can slide them forward along way to 'squeeze' people in the back.