with my CAPS it gives me *NO DATA* for the part number of the rear bumper skin itself, however MB861229 (which has been superseded by MR555950) is the part number of the 'FACE KIT, RR BUMPER WHITE'. MB546011 is the part number of the metal bracket and MB546095 (superseded by MB545972) is the chrome bumper moulding.
As for the front bumper it's the same deal for the bumper skin itself, with the part number of the bumper kit (skin, moulding and clips) is MB860495. Reinforcement is MB642373 while moulding by itself is MB545972. This is for the 'Evolution' type bumper with the extra vents down the bottom.