Can I use any 203mm Boxxer to 74mm post mount adapter for my new shimano 810 saint disk brakes? Shimano's trying to bend me over a table with their 38 dollar part; magura and avid's pieces come in at about $10, which is perfectly reasonable. Will I have to use excessive spacers, or is there a special fitting or function to the Shimano pieces? I'd rather save money here if possible.
