when i owned my Capri back in the 90's i had this cover for the car. it only covers the interior when the top is down. i loved it. i been looking for one since i got mine again. but really started looking when i put the new seats in. they are hot as hell in 120deg temps. they have several to choose from starting as low as 30 bucks. thought i would pass it on. i'm gonna order one real soon
http://www.streetbeatcustoms.com/1991/Mercury/Capri/Accessories/Car-Covers/