looking for a Low Temp thermostat



The main coolant thermostat is set to open at 87 deg C, for emission purposes this engine runs a bit on the hot side, apparently. I understand there are possibly 81 deg and 71 deg thermostats available. I’d like to find a MB authorized part in this range, and hope someone here can help me in this quest.
I do have a part number 122 203 0275-71 that I obtained from AutohausAZ. Unfortunately it is made by Trucktec, which has a horrible reputation in the quality arena. I don’t want to put my engine at risk with a low quality thermostat, so I am continuing my search.
Can anyone give me a MB part number that I can use to order this from Mercedes? Any suggestions welcome. Thanks to all in advance.
P.S. I still love my C43 after a year of playing. More fun in the Texas summer than a 47 year old 911, to be sure...


