To help you out, ALL 68-69 A and B body bucket seats used the same seat frames. So a bucket seat base from a 68-69 charger, road runner, etc would work as will one from a 68-69 dart. What makes them different is the seat tracks bolted to them and the upholstery on them. LH and RH 68-69 seat base frames and seat back frames are even the same part. There provision for locking latch on both sides. All done to save assembly costs.
