Here we have my trusty Thule 757 now (7104) Foot Pack and Thule 515 Aero roof bars. The total length of the bars including end fittings is 125cm, so the usable rail is 120cm.
This footpack is for raised bars and originally used on my BMW E91, however I've found that they fit a wide variety of raised roofbars.
Each footpack and bar end is locked with the same key code - ie 8 locks in total, including 4 keys.
The are in good working condition, showing the inevitable signs of use from a few summer holidays. The rubber inserts are cut about 30cm in to allow easy fitting of a single bike rack alongside a roofbox, which the 120cm rail length enables.