Cabby Fuel Filler Pipe Change

It's no good, can't put it off any longer.  Gonna have to change the filler pipe on my cabby.  Tried searching for some guidance/photos for the job but couldn't find anything.  Any tips?

its dead simple, neck is held on with 3 screws under the black sticker around the neck, a screw in the wheel arch area and the rubber hose to the tank.

the tricky part is if you have a later cabrio and you're trying to fit a tintop pipe, it needs a bit of a tweak to fit. few threads around on that but it should be pretty obvious what needs doing if you compare the new to the old. i believe crazyquiff does a direct fit neck for the later cabs, gsf does the tintop/early cab filler neck i believe