This is what is on the 216/235/261. Eaton 6100x2 (NAPA carries this part)


Tube Connection / Fitting, 0.125 in (3.2 mm)
3 Images

Part: WH 6100X2
Product Line: Weatherhead
Material : Brass
Tube O.D. : 0.125 in (3.2 mm)
Description : Nut
Dimension C : 0.375 in (9.5 mm)
Dimension D : 0.130 in (3.3 mm)
Dimension L : 0.500 in (12.7 mm)


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.