Welcome to the F6B family.
I would LOOOVE to not have a backrest but my lower back needs support. On my previous VTX, I had a Mustang seat with the passenger pillion which gave me 9" of good solid backrest support. Looks like F6B Fastback has 8" of support.
Mustang doesn't sell an addon and I've never seen or heard of someone adding an aftermarket.
I was able to get a used Ultimate with a drivers backrest and I think I got it from a user on this forum. You could also look at the Goldwing and F6B groups on FaceBook for used options.
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