the mercedes number for the cluster illumination bulbs are 072601 012240 it is 12 volt 3 watt. it will look like the picture below. there are special tools that aid in removing the cluster, it could be damaged if you use other methods, they are tool number 140-589-02-33-00 i have sen them on ebay in the past, but none are there now. any mercedes deler can order them for you. see pictures below