Thanks Recarno,
Always a pleasure hearing from you and your sound advice!
It would be great if you could share your knowledge and publish a thread that explains (and shows) precisely what a 67 or a 68 sport seat should look like and how to identify them precisely.
I thought early seat where narrower, more tapered on top than later ones, and with the latch at the front of the seat, but clearly there is more knowledge to be shared!