Hi there it will all swap over you need the the appropriate black tool box for the seat unit you use but the subframe will work the black under tray differs 21’28 for the rear pillion pegs if you go 28 to 21 there are no front seat screw mounts they are on the subframe of 21 but on the main frame on 28 but that’s it the tank is no prob either, think that’s right 😉👍jonmac
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John