I had a 71 Demon with seats like that. Take the medallion from the seat pictured below and they look the same.
I know what your talking about but when I looked at the new covers from Year One the seat bottom stitching isn't even all the way across like mine are. There are wider areas between the stitching towards the outside of the seat on the replacements.
yes there was a clear difference between the insert and the sides where with these seats they flow as one. I vote recovered, but correct seats.