3/8" x 24TPI thread on one end and 1/2" x 20TPI on the other end

left side of your unit Triumph engine and plug the hole with some class

or other spoked wheels mounted on narrow triple trees

then you need the low output generator to keep from over-charging your battery

This Universal Frisco Gas Tank Mounting Kit with Brass Inserts includes a pair of custom laser cut mild steel plates

#2926-2 Front Axle Nut and Washer Kit 1952-1972 Harley-Davidson K/KH/XL/XLH/XLCH - CAD Plated Subcategory_Oil Tank Caps 3/8" x 24TPI thread onCAD plated OEM# 43886 52 9 16" x 18 TPI nut and lockwasher used on 1952 1972 K, KH, XL, XLH, XLCH. Made in Ohio, USA.