Which MLs does this bumper fit 163 880 39 7
 

I am trying to find out which years and models Mercedes ML that a bumper i just got will fit. Problem is the part # is printed on a sticker on the back of the bumper. not embossed into the plastic like most other mercedes parts and one of the numbers on the sticker is unreadable. the #s i got are 163 880 39 7 and then the unreadable number. can anyone help me figure out what this fits on? thank you. jay :)

front or rear bumper?