#6 x 32 UNC. https://www.classicbritishspares.co...-light-lens-mounting-screws-2-99-9947-1973-82
"New Triumph & Norton Lucas LU917 Tail Light Lens Mounting Screw Set. 2 screws are included. Each screw comes with a zinc plated finish, measures 11/16" under the head with a thread pitch of 32 (UNC). Fits Triumph & Norton models (Commando, T140, Bonneville, T160, Trident, Etc) from 1973-1982. Please refer to your parts catalog for proper fitment.
*****Please note that this Screw set will only work with LU917 Tail Lights as used from 1973-1982!*****"
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