GREAT BUT UNFORTUNATE
The service is great but unfortunately, GM's recommended replacement parts don't always fit. I ordered a VIN specific replacement thermostat for a 2014 Sonic. The part I received was correct according to GM but it didn't fit. I returned the part without problem. Later, I bought a VIN specific replacement thermostat from my local GM dealer, which again wouldn't fit. The solution that worked in the end was to buy and replace the complete thermostat housing.