Fairing Plugs can be purchased from a dealer -- or you can search the forums and see what options other members have used that may very well be cheaper.
instead of paying 80 dollars for fairing plugs to cover up just go to lowe's and for 80 cents a piece you can get black plastic plugs to fill the 4 holes. real easy and the best thing is to take the mirror with you so you can get the right size. the plugs are located in the specialty automotive bin with the speciality washers. good luck on your decision.