Hi Ludo,
The driveshaft you're looking for are UM510 (complete driveshaft assembly) or UM510-02 (wheel axle only).
Strangely enough, I had one break exactly the same yesterday morning (in controlled practice of my first ever french national, sic)
It's worth noting that I now use UM522 which has a slightly shorter wheel axle (removes the 2mm spacer between the bearing and the hex) which is what's provided with the RB5-SP (and SP2).
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