The thermostat for all m103 and m104 engines should be the same.
I think you can go to a local parts store and pick up a set of sockets that are labeled E6-E10 for the star configuration. I left mine at work and needed them at home. I purchased a set for $15.00 at AutoZone.
ASE CERTIFIED MASTER AUTO TECHNICIAN
MERCEDES SPECIALIST 11 YRS