Dave...............although I can't say anything about Corbeau seats as I have never used them myself or even had buddies that used them.
What I did want to tell you is you may want to look at some seats from a salvage yard. I have buckets from an mid 90's honda that have a lever for lumbar support, another lever that actually raises and lowers the seat and adjustable headrests .
I guess too that for the cost of buying Corbeaus, you could find something nice in a yard that may even be the right color you want and have more amenities already and a lot less money.