My 54/55 wiring light-attachments are probably a little different from yours, except for the headlamps.

The bulbs have three "prongs/blades" and the headlamp leads from the terminal block on the firewalls should have a 3-lead socket.

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.