Massey 6400 7400 cab spring conversion. Comes with the correct high tensile bolts. These are the correct length and spring rate, not like alternatives that have too strong a spring that will make your cab feel solid mounted and make the cab sit too high. Quality make, made in europe, not cheap Chinese crap. These will bolt straight into models 6465 – 6480 7465 – 7480. The last 2 pictures show how I changed mine. All aftermarket springs need this doing, just people never tell you.