These 4 position racks fit the entire Transatube and Maxi Transat line.
To replace your old racks (3 positions), attached by 2 rivets:
1) Remove the 2 rivets with a drill (with Ø6 drill bit)
2) Enlarge the 2 holes Ø6 with a drill Ø10, only on the side where the rack is inserted (do not drill through)
To replace your new racks (4 positions), the installation is very simple thanks to their integrated screws.