I'm looking to replace the front calipers on 2008 s60 2.5t. As far as I know, the disc brakes are 286 mm but everywhere I am finding them for a decent price remanufactured are 305 mm. Any idea where I can get the right ones?

 

check rockauto.com

or EBC Brakes, i Have ebc's all around on my car with the "red stuff" pads (low brake dust)

 

If the sizes are not listed, what should I assume the size to be?

 

2.5T came with 286mm rotors and 16" wheels.

T5 and R models came with 305 mm rotors and 17" wheels.