I was looking at the mercedes-benz-parts website, and noticed a 'badges' catagory
The pricing of the badges seems to be 'value' based :-)
CDI, ML270, ML320, ML350, ML430, ML400, ML500 = £13.19 RRP
AMG = £32.35
ML55 = £22.70
Either the '5' is a lot more expensive tha a '0' to make...