Sargent does redo the stocker. As for the Corbin, it has a backrest practically built into it. The rear of the front seat scoops up and lets you sit right up against the rear cowl. It lets you sit back further. It does not inhibit forward seating either. I only use it for long trips because it is heavy and I had the stocker redone to allow better lean-offs. The corbin is not for the track. it is perfect for long trips and especially for a passenger. If you plan on riding more than a couple hours a day, I highly recommend it. Otherwise just recut the stock. Shouldn't be too expensive. BTW, I do occasionally see used corbins on ebay for the 9er, but they go for near retail price anyway, so don't wait around looking for a deal.