The part in detail:

Part B66851713 , 6mm 2 Lock for New Alustyle Bicycle

Type:6mm 2 Lock for New Alustyle Bicycle

 2 Coil locks for new alustyle bicycle rack 2 lock 6mm with simultaneous locks

Optional theft protection, e.g. in conjunction with New Alustyle bicycle rack (B6 685 1704 / A0008900293 / B66851711 (1x)), tailgate-mounted bicycle rack, model series 169, "Q2" (B6 685 1123 (2x)) or tailgate-mounted bicycle rack, model series 245 (B6 685 1109). Set comprises 2 coil locks with common key.

Price: £25.20