They will! I got a five lug set up with dc2 front and rear brakes, and when I picked up my EK9 shell, came with front calipers with ds2500 pads. Just fitted those pads onto my DC2 brakes last week! so I don't see why it shouldn't. dc2 and ek9 brakes are meant to be the same at the front and there's a wee bit of difference with the rears iirc