>>> LG嫌不好看??? It is amusing to read this.
It is not complicated at all.
First and foremost,don't ask your dealer to do the job.
Second, your dealer should have a "parts" department/division/whatever, you will need to buy the package (part). Yes, mirrors are sold as units. This should be cheap. As far as I know, even heated mirror costs about $150.
Third, if your hu*****and is not handy, find a garage to get it installed. It won't cost you more than half hour labor.
Forth, if further painting is needed, go to a paint shop.