has any one converted a 1965 mustang coupe rear seat to fit in a convertible?

[octo]

hello i know this can be done i just need some guidance as to how its done. i have a coupe 1965 mustang rear seat that i wish to modify to suit my 1965 mustang convertible  i know theres changes that need to be done at the top of the seat and the bottom what i don't know is what measurements i need to take off from either and i am not sure if theres any other specifics that i am not ware of i am quite handy with trims so i am confident if i had the measurements i could do it, pleas if any one has done this put me on the right path

thank you

[67FBGT]

Best you borrow a CV seat so you can modify the structure of yours to match it.
The overall squab shapes are different, as is the seat width across the car.