Quick update. Was able to identify the striker assembly needed for the rear recliner seats and ordered them. I have to take the liner off the cab wall to see what needs done to put the striker latch on, crossing fingers but not expecting it to be as simple as "bolt and go"... on the plus side, the 60/40 seats, the "60" side seat matches up with 3 of the 4 existing bolt holes. Still hoping for some magic answer on how to get everything lined up - even if that means different rails/brackets - I suppose worst case is going to a local fabricator shop and seeing if they can solution something that will work.