They just modify your existing seat. You send in your seat, they open it up, strip out some foam, insert a bladder for height adjustment, and sew it back up again.
You are getting your old seat back, so it is not a replacement.
You are paying for labor only, but the labor looks top notch. Looks like they got rid of that ugly corner seam as well. :thumbsup
I am looking for a way to modify the rails themselves.
My biggest hold up on this is depending on UPS or FedEx to get the seat there and back in one piece.
I use them all the time, and I have some of the best packing people in the world, and they still find ways to run the packages through a time machine and age them 20 years. :wink