My coupe didn't come with a seat but I wanted an original with the lift up back.
I bought all the wood of the seat, ready made from Lebaron Bonny. The seat cushions were also new from LB.
I now had the wood assembly and original seat runners which I used to construct a new steel base to tie it all together as original.
The prop is a '36 trunk prop from Bob Drake and the hinges are general hardware store.