an ebay seller told me that his manual does 17-20. "It covers up to 2020 - on 2021 they added a few new features that would not be covered." Anyone know what those things not covered would be? And on another note, are there any physical features on the 21 that would have changed enough to make things like non-OEM windshields, footpegs, handlebar options, etc only for 2021?