These lightweight covers are over 25% lighter than stock and a unique custom replacement for your Unit Triumph engines. Price is for ONE individual cover. The 4-Bolt fits the one year only 1972 TR6 and T120 replacing part: 71-2572 The 6-Bolt fits the 1973-1983 TR7 and T140 replacing part: 71-3671 Made from aluminium and supplied in glass blasted finish it is ready for you to tailor to your preferred style Notes on Fitment 4 Bolt Gasket: 71-2574 6 Bolt Gasket: 71-3673 Screws: 1/4" x 20TPI 3/4" Socket Cap Head or Fillister Head only (no hex head) Clean items before fitting to ensure no unwanted particles enter your engine. If you're not qualified to work on motorcycles seek an approved mechanic to perform the work for you. Some fettling of the parts is to be expected as as triumph rocker box castings can vary between machines, and production runs.