Your aunt has a ML320. To see the ML500, go to the MBUSA.com site and click om the ML500 chapter. Many many people have done the conversion. I understand there is a chrome strip you can buy and paste on the ML320's grille to make it look like a 500. Alternatively, it's very easy to remove the 320 grille and replace it with a 500 grille. In my opinion, the 320 grille looks better tha the 500's, especially in the darker color trucks.