This is the Prism Supply take on the classic bullet light. This taillight includes a dual function 1.25" LED that acts as a brake light and running light. The housing is made of aluminum and size of the housing is 1-3/4"  diameter by 2-7/16" long. The wires exit through the bottom of the housing through the bolt.

Comes with a stainless steel lock washer and a 5/16 hex head bolt for mounting. 

Will come with flat and dome lens.