New! Triumph Primary & Gearbox Cover CEI Chrome Dome Acorn Nut. You will get the one as pictured. This set comes with a great quality chrome finish that is ready to be installed! Nuts have a thread pitch of 26 (CEI). Can be used on the primary cover or gearbox cover. Fits most Triumph 350, 500 & 650 models up to 1968. Please refer to your parts catalog for proper fitment.*Please note that this nut set has a thread pitch of 26 (CEI). Later models from 1969-On have a different thread pitch and are not compatible.*Made in the UKO.E.M Part number is 97-1531