Upgrading wheels
Stick to wheels from the W463 chassis for the correct bolt pattern, offset, and hub bore. A 19" wheel from a W463 G63, G550, or GL/GLS will be a direct fit. Avoid wheels from sedans like the E-Class.
Also, you'll need new tire pressure sensors and a full alignment. Make sure the overall tire diameter is very close to your original setup to avoid speedometer errors.
source:
2021 GLC Wheels Guide
https://www.wheel-size.com/size/merc...c-300--255-913





