We have a one owner 69 pace car bought in NE ohio. I has been garaged stored? Never seen snow! 74K miles The interior and chrome are 100% original! My question is the seat backs have faded in color more than the rest of the interior! Would it reduce the value of the car to replace them? We even have the original boot and its not nearly as faded as the seat backs! Any comments would be appreciated!

Anybody who wouldn't buy a nice original car because the seatbacks have been replaced is an idiot.
Get the new seatbacks and dye them and enjoy the upgrade. Keep the old ones around and include them when you sell the car someday.
Merry Christmas!