5 MM / 11/16"

They are a thick

allowing you to run the 650 Triumph exhausts that have a 1

Parkerized complete hardware and mounting kit correct for all Harley-Davidson Big Twins 1936-1944 with stamped steel cover

You can run this as-is

Lecter LED Tail Light - Black Brand_Solid Custom 5 MM / 11/16"This tidy, cast aluminum tail light has a 2" diameter lens and works as a running and brake light, as well as having license plate illumination via a slot on the underside of the tail light. The rear mounting studs are on 30mm centers (1. 18") and the widest point of the light housing is 3". As far as the wiring, yellow is for running light, red for stop light, and black for ground.