Cheers, it is a Nissin mastercylinder and my setup is Brembo, the bore will probably be about right for one Brembo caliper but I'll have another go at contacting him and see if he has the Nissin caliper for sale as well as he seems to have broken the bike for sale. What search did that come under, looked under XT660R parts but perhaps I missed this.
Thanks for the heads up.

Pete.