Be sure that the shift lever on your 59 will clear the flat wheel. The 57-59 shift lever and turn signal switch levers are angled to correspond with the deep wheel. They are flat on 55-56 trucks. The horn contact plate is the same, the horn button is different.
Fred

1956 3100 Pickup/Red/350/3sp OD/PS/Disc Brakes
1957 Bel Air Sport Coupe/Red/355/TH350/PS/Disc Brakes
2017 Silverado LT Single Cab SB/Black/5.3/6 Speed Trans
1947 Willys CJ2A w/F-Head engine