According to caravanparts.de the Cateye Evolution 1.0 was fitted from 2019-22 and the Cateye Evolution 2.0 from 2022 on. 300 and 470 Euros each respectively but they don't list the UK as a delivery destination.
The same unit appears to be fitted to all Knaus motorhomes so could well have been produced especially for them (as I know to be the case with my similar Eura Mobil rear LED units).
Wishing you the best of luck but you may end up having to order from Knaus.