Need help finding right seat material

I have a 72 Dart Swinger and the seat bottom of the bench is torn, my problem is when I have contacted Legendary and SMS Interiors I give the interior code and the samples are not even close. I was told that I might have what is called the White Hat Special ??
I would love the redo the seat as the rest is in great shape. If any of the members could tell what I have I would be grateful. I will include some photos to help,
Thank Jim