Above topic. Nice find Ben.
It was me. Yes they just flip out and press back in.
See if I can dig the info out. Had some spare ones. But they disappeared with my cable.
I bought mine via eBay. The one above is the only one I can find. Will need to check compatibility for the c5 with the seller.
I think they were around £40 when I bought them.
Must admit. I am tempted to get the steering wheel.