Wellllll, I am sure you all realize that at this stage of the game there is nowt even vaguely set down..
this is a toal and complete guess but I reckon somewhere bewteen 35 and 55 quid a pair ( most likely more towards the top end than the bottom )
I know its a lot of dosh, but it is WAY cheaper than the jap option ( 118 quid I think was the last I heard ! ) and as it is for one specific make and marque ( although they would fit the indicators on that oval piston thing ! ) such items are always gonna be expensive.