I talked to the owner at the Nats last year with the red Cuda.
The seat back was narrowed and hinges removed , I think the seat bottom was shortened some and moved forward , compare the pics of it with an untubbed car
It was the best job Ive seen yet , and hard to tell unless you had them side by side or owned one .
He told me he had a lot of time in it to make it look factory
Donnie