Both studs are 5/16"-18 and are 5/8" long

Key Dimensions: The threaded portion of the switch is 3/4" long

Chrome Body / Chrome Bezel or Black Body / Black Bezel

fit all 1997-99 FXST

Mid-USA Hardbody

Rectangular Motorcycle Mirror - Perch Mount - Black Material_Brass Both studs are 5/16"-18 andNeed that mirror to stay legal, or clear up a fix it ticket from the man? No billet, skulls, or LEDs here! This is a classic, compact square motorcycle mirror equipped with blue tinted glass for a retro feel and to cut down on glare. This mirror can be adjusted and mounted on either left or right hand side. The stem is 4" long with 8mm x 1. 0 threads, the mirror is a tidy 4 1 2 inches by 2 1 4 inches, and the whole assembly is black coated steel.