Olsyno

I was told by the MB garage after an annual service that one of the MAFs was bad. The MB garage offers only the complete unit containing the manifold with both MAFs which is very expensive. I bought 2 Pierburg part # 7.22684.07.0 from a UK internet shop. The MB garage offered to change them during the MOT of the car. I was told by the service manager when I collected the car that I've got the wrong MAF. I've checked Pierburg part catalog which is showing the exact same part # I bought. The MAFs I've got looks like they shall be "bolted" whilst the MB service manager mentioned that the MAFs on my car is clips mounted. I don't have a clue so can somebody pls. provide me with the original MB part number and/or a picture of the original correct MAF?