Bucket seat help

Hello everyone. I need some assistance regarding my buckets. I have a great set in awsome shape. I have no idea what year and they dont seem to be the ones that tilt ahead. I have enclosed pics. Theres a metal tag on the underside...#4358481 under that # is 63729. Hope these #s and my pics can help you help me.BTW the lever is in the front lower aspect of the seat. ?????????as for tracks it has something there but what else am i missing?