Stock Style 3" Universal Mount Round Mirror for Harley-Davidson Models - HC-MR15 Stock style 3" Round, universal fit mirror. Features a mirror glass that measures 3" in diameter. Stem length is 3 3/4" long, stem height including threads is 2 3/4" tall. 5/16"x 24 thread mounting nuts and washers are included. Can be used on either side of the handlebar.