Thanks for the feedback! I bought them from
For £297 and the part numbers are 8W00725303Q0
The part # quoted is for the version without the blindspot cut-out. Here in Oz, B9 S4's are specced with 'Blind Spot Assist", Part # 8W0072530A3Q0 and is significantly cheaper.
The 'Black Package' on a B9 S4 here has the black mirror caps as a mandatory option. We hated the silver & black, so purchased genuine Audi carbon-fibre caps and had them fitted by a body repair shop I trusted. If you see the underside of the cap, one will easily understand why.
I purchased them from:-
https://europrice.us/audi
Alex there is friendly and professional, incl. good communication skills, and recommended by AudiWorld, US forum. Shipping was fast.
They were the genuine article, shipped out of Gloucester, Eng. (yes, a US seller) and even with shipping to Oz, was many $$'s cheaper than Audi.
To me, after quite some research, the Audi version appears to be the only genuine 100% carbon fibre (except for the attachment tabs) cap on the market. All others are a 'cf' layer over an Audi cap as a base. This is to maintain a perfect fit.