Seat 415C

Looking for help with the seat configuration.  My Coupe has had the seat changed at least twice in its history.  It was converted to bucket seats in 1978 and back again to a bench at an unknown date.  Currently it has a flat pad sitting on a flat bench with Velcro to secure it.  When I bought the airplane it came with an upholstery kit from Airtex and the bench seat is not like the current seat.  I have attached a picture of the current seat and a drawing from 1975 for the modifying to bucket seats. I am going to change the window welt and the side windows this month and wanted to do it all at one time. Replace the old interionr with new interior and new windows.

So if anyone has any good info to pass on, I would surely appreciate it.

Thanks, Ron