SOR had a few sets w/ brackets a few years ago, on Sale. They were the 60/40 bench, and different from the ones pictured, above; They were in their upholstery shop (some redone, some stinky raw) and I went and sat in them and decided I liked the full bench seat better. I don't remember exactly why, but I think the split rear bench only folded flat with both down. One side wouldn't fold flat separately ? Also, the small side didn't really fold down enough to justify the cost. Plus, they're built for RHD truck, at least the ones I saw.
