Jerry,
The picture showing a bell crank in not representative of 56-59 trucks and the 60'are altogether different. The 55 second series looks like the illustration but in the 56-59 the shift levers are pointed down and the rods are hooked up directly from the shift box to the shift arms.
On the 55 the pivot is on the bellhousing and you probably do not have that bellhousing. I would look for the shift rods and box from a 56-59 which should mount up to your existing column. You may also need the corresponding side cover on the transmission to make everything fit
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