ThingKing
Child in Time
Those bags look suspiciously like CS4 (see my bike), formerly K-Drive, also in Belgium.
Yes, they do! But the CS4's are made from real leather, and mine are slimmer (14,5cm - just under 6 inches, while the CS4 bags are 18,5 cm).
Speed update: 130mph on a short stretch before I ran out of street. Everything still planted and stable.