Louise they use standard generic KT/Kuenteng electronics you can use any 10 pole PAS disc/sensor for about £10.
As I mentioned in #7 above you just have to get the wire sequence correct we can tell you how. If you need one with the moulded Julet waterproof connector just say we can find you one quite easily online.
All ebike parts are practically Chinese so it is cheaper to buy direct via China.
For Square taper crank axle.
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For exterior bearing type crank axle, like Hollowtech 2.
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