According to the parts listing, the one with the knob wouldn't be correct for a '50 pickup. Those were used in later years on pickups and on lots of passenger cars.(blue highlight) The one for '50-'51 pickups is listed as 17-1/4" long (yellow highlight)
Kevin 1951 Chevy 3100 work truck Follow this saga in Project Journal Photos 1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car) Busting rust since the mid-60's If you're smart enough to take it apart, you darn well better be smart enough to put it back together.