Our original #4 standard rhodium front surface mirror replacement face coins fit original legacy Nu-Bird mirrors purchased prior to March 2020. ** Very important to check the back of the mirror housing to determine size. ***If there is NO NUMBER ENGRAVED then a size #4 mirror is required. ****If a # 3 is engraved on the back of the mirror head, #4 coins are the WRONG SIZE. NEVER TRY TO INSERT A #4 SIZE INTO a #3 housing AS DAMAGE WILL OCCUR. ***Our special Mirror removal KEY is needed to replace the mirror coins and can be purchased separately in our Store.