Well them discs do confuse me, Brembo do not do drilled and grooved discs in any of their ranges (I do wonder if they are old stock or badly listed?)
and all my discs and pads are priced per axle set (2 discs, 4 pads etc) (Google hates me listing them like it but I would never sell just 1 disc, I let ecp get the low google shopping prices using the price for 1 disc despite they wont sell them that way! (ok maybe they would?))
bb