This is a replacement turn signal light , to replace the solid plastic lights used on the RE pro Whizzers . The original lights are no longer available from the manufacturer , and are hard to find. This light has a rubber mount , so it does not break off as easily. If you have a broken light , best to buy 2 , so the will match on the front or rear. Mount the same as the original, slightly larger that the original . VERY NICE LIGHT! I have complete turn signal light set using these lights listed also.