Hub width measure 3-1/4"

and 3/4" thick

Fits H-D Big Twin & comparable S&S front motor mount bolt patterns CNC'ed billet 6061 T-6 aluminum construction Designed to install Lowbrow FiltroMax Remote Oil Filter (sold separately) between down tubes on custom motorcycles See Related Products below for the Filtromax Remote Oil Filter

Do not exceed maximum torque specs

The spark plug end then simply snaps on to the spark plug terminal

Brass Gas / Oil Filler Cap - Unvented Vendor_Cooper Smithing Co. Hub width measure 3-1/4"These universal filler caps are meant to be used for either gas tank or oil tanks on custom motorcycles, hot rods, or anything else. Lowbrow filler caps fit the maxim 'form follows function'; they are all business. Machined out of solid brass, these non vented caps are 1 5 16" 12 thread and the Buna N O ring seal is gas and oil resistant and keeps your fluids contained, leak free. Lowbrow filler caps fit our weld in steel filler bung or aluminum