It cost no extra to have changes made. I had the seating position brought forward slightly, had the pillion seat lowered so less of a 'step' up, and had the shape at the rear of the seat changed so looks more streamlined to go with the bike. Pictures below.Out of interest what are Corbin charging people that get a gunfighter and have some changes made.
I see you're in Australia. Like me, as I'm in NZ, you won't be able to deal with Corbin directly at all. I bought mine via the Australian distributor Select Edge Motorcycle Accessories . I can't rate these guys highly enough to deal with, excellent prompt communication all the way and they went way out of their way to make sure all the changes I wanted happened - including exchanging drawings and even sending photos of the seat from Corbin while they were making it to make sure I was 100% happy before the cover went on. Corbin seats are premium quality and the service from them and the Australian distributor was premium also.
Can't wait until New Zealand's full lock down is over so I can put some more miles on it.