Bucket Seats (yes Again)

Sounds like you need the factory early-a bucket seat risers to use as a template. There is no bench only floor, but you're right about the floor being higher beside the trans tunnel.

The bucket seat risers can be unbolted from the seat, I have my passenger seat out at the moment and am painting the risers/brackets. If you need me to, I can get you some measurements from mine.

Also, how do those seats bolt in? I'm assuming they have studs on the bottom? If so you'll have to use the measurements as a rough guide since these bolt onto the seat sliders from the side.

Here's a pic of the passenger side inner (beside the tunnel) bracket: