march k11 calipers fit the k10 and allow for the fiment of vented k10 disc's (found on the figaro and other k10 varients Be-01, PAO etc)
the discs are avaliable form brakeparts.co.uk and are cheap, however calipers cost about £45 each. vented disc's will not fit a k10 using standard calipers as
there is a very recent post in the mechanical section where i listed all the various options mate have a look through that