Shape of '70 duster rear seat bottom

Hello...the upholsterer says that my seat is wrong and should not have the rear corners"cut-out".He says those cutouts are for newer seats with seatbelt retractors.He gave me a seat to try(suppose to be the proper one without the cutouts) but it won't fit...(the rear corners hit the wheelwells. Anyone have a picture of a 1970 Duster rear seat bottom so I can show him? Thanks, Dan