There is a logo at the 7 o'clock position, can anybody identify this sprocket manufacturer please? I don't have a better photo I'm afraid.
Mystery solved. It is a carrier and sprocket from Driven Racing in the USA. Not compatible with anything so I've just ordered a full Renthal and DiD kit.
Could you not have sourced a sprocket from the US, as opposed to a complete new QC carrier and sprocket from Renthal? Either way, both are good quality products.