Ah, the factory split bench. BCG is a decent company, although I feel their prices are too high and I've caught them selling non-G body parts as rare G parts before. I believe those cases to be honest mistakes, and the people I've dealt with are very courteous and straightforward.
The split bench/ bucket swap usually goes the other way but the facts remain the same. They both use a total of 4 brackets, and since you've got buckets I'd hope that all of the factory style mounts are present on the floor. You can use the "wrong" brackets so long as you modify them, or you can fabricate some adapters. I'm currently riding on bucket seats sitting atop my old split bench brackets and haven't gotten around to doing that yet. The seats are solid but will flex when only bolted down at 3 corners.
I removed a split bench seat that was very, very similar to the one you want, although mine isn't quite as nice. The driver's side is all tore up. I was going to hang onto it but the dream of keeping all my factory parts isn't feasible so I may have to let it go, though shipping prevents many deals from happening.