You have a:
1950 Chevy 3100,
What type of transmission do you have?
3 speed and 4 speed trannys have different front yokes/flanges.
All 47-54 Car & 1/2 ton Truck torque tubes, use the same u-joint/trunnion and rear yoke. PICTURE scroll down lower right corner of page.
Regardless of what type of tranny.
Cut away view of Torque tube scroll down.

Parts needed to replace u-joint:
Ball housing collar paper/gasket shims
Ball housing collar cork gasket
Torque tube retainer (screw on ring) 2 steel O-ring washers and 1 rubber O-ring oil seal.
u-joint, u-joint bolts, u-joint bolt locking plates.

Parts needed to install Okie bushing:

Okie bushing
Front Torque tube bushing puller tool
Read my Okie bushing POST
How puller tool works. Picture

These GUYS Northwest Transmission Parts have everything you need to do the Job. Ask for John
Make sure to fill tranny and ball housing with gear lube before you take the truck for a ride.

These GUYS vapinc.com make the Okie bushings & bushing puller tool that everyone sells. Cheaper

Remember to keep your ears out of your fingers smile