This part is not original. Converts a female 3/8 inverted flare to female 1/4" inverted flare.
It adapts1957 type power steering hoses and ram assembly to hook up to a 55/56 control valve.
The 55/56 control valve uses a 3/8" tube and fitting and the 57 hoses use a smaller 1/4" tube and fitting.
WHAT WOULD YOU NEED TO USE 57 CYL WITH 55/56 CONTROL VALVE?? You would need the 57 ps cylinder, two 57 hoses and two adapters
SO: 1- 3A540B