. Hi , The Keys you will need for mercedes are S17,S20,S21 personality keys. The cartridge is called a primary cartridge its number is mt25001103, the cables you need are a MB1 38 pin,MB2a analog connector and a DL16 whic is the OBDII under dash connector. Go on snapon tools . com to buy the keys they are new and cheaper than anything else on e bay. My MT2500 is the plain jane model no color no graphing.
I am a very good shopper
