Billet twin piston rear caliper for 84mm fitment. Came with a job lot of parts a few years back, but I have a kit one so surplus to requirements. Looks brand new and never fitted. Comes with pads. £75 inc posting (UK)
It will not fit the standard bracket and will need an aftermarket underslung bracket to fit it. Same fitment as the brembo ones I've seen people use, but happen to take measurements if people want.
I'm afraid I don't know the brand, I didn't buy it new. It came with some other CBR pieces I bought a few years ago.
Wish I had the equipment to machine stuff. Remember my metalwork classes were the best hour of the school week!
Shane, I did see this bracket on eBay, item number 321899791753 that is designed to accept a billet bracket.