That is the correct style of jack but different sized trucks had different sizes of jacks (different bottle heights and lift heights). I have the dimensions for 1954 - maybe someone else has them for 1951 3/4 ton trucks (it's in the restoration pack specifications sheets). I'll look up and post the dimensions, if you want them

Tim

Tim
1954Advance-Design.com
1954 3106 Carryall Suburban
1954 3104 5-window pickup w/Hydra-Matic
The 216 and early 235 engines are not "splash oilers" -- this is a splash oiler.