Brake Rotor Size Rear

[DazzerJ97]

Hello All, 

 

Can't seem to find a definitive answer on this, looking at the brake rotor size on the rear, I come up with two sizes, 282 and 286, my model is a 2.0tdi DSG.

 

Is there a difference to the sizing for the electric parking brake or?

 

Any help would be greatly appreciated, should mention my rims are 16's