My man who can came through today with 500mm ally seatpost tubes for my MRD's. Was struggling to find a post long enough for a decent riding position because the frames are so low slung and seatpost extention is so long, it may snap is over exerted. They are exact diameter to an old school post, plus the best is they are the same thickness as an Renthal post. So chuffed bit of a good polish and well away.
Not that cheap tho
Great tho cos straight ally posts especially Renthal ones are like hens teeth.