*UNTESTED* Original DELCO MORAINE Master Cylinder for 1953-55. GM #5450233 (small '233') ; Metal End Cap #5454480, 320-G. 1" Diam. Top fill cap marked 'USE G-M-C BRAKE FLUID' with '5300880' on top cap bolt head (see photos). This unit is UNTESTED and likely will need a re-build (plus a new rubber boot) after sitting on a shelf for decades.