Hello JunB. The first thing you should do is become a full member which will give you access to much useful information that you will undoubtedly be referring to from time to time.
But to answer your specific question, become familiar with the Technical Manual. If you click on "Technical Manual" at the upper left, then click on Main. TrailindexPage you will see the subject of Data Cards. You can also decode your paint code and optional equipment tag using information in the same section. And 180g is described as Silver Gray.
The item you need for full identification is the Data Card. If you search the forum you will find many references. It is apparently available through MB for a charge and you will have to show proof of ownership. Without the data card, knowing for sure if your Euro bumpers and headlights and USA style marker lights are correct for your car will be difficult.
Best of luck with your new car! Lee