69 darts seats in a 68 dart

Hey guys i just picked up some nice 69 dart buckets for my 68 dart, i am thinking about buying a 69 rear seat cover to match the front buckets. I like the 69 pattern more than the 68, but i want to keep it colse to a 68 as i can, did they build any 68 darts with the 69 seat pattern late in the 68 year? is anyone else running 69 covers in a 68? thanks