See a note that was made ,said rev.-eye makes spring longer/fact is only thing that matters is how long the spring is in car with full load on it !! So the shakels are about 45*,the rest is pertty don't care as far as spring size other then how they ride . Axles,Ford 1942 to 1948,are the same really,only in 48 Ford added 2 holes for tube shock near the kingpin lock hole. I like these 42 to 48 axles with factory drop built in. 48 is what I used in my first hot rod build ,I did in 1959. The front spring is custom done from parts of 3 other leaf springs,that I fitted together to make up spring for ride hight an how soft I wished an being out front of axle lets frame be lower plus softer ride . The rear is also set up behind the rear axle for the same thing.