Steering box

[Angel]

I have a 57 chevy 2dr. hrdtp and a 57 chevy 4dr. sedan.I started to restore the 4dr. with a frame on.I replaced the complete steering components on the 4dr. and a rebuilt treadle vac. power steering unit.My question.Will all the
parts work on the 2dr. hrdtp.I might add that I'm doing a frame off on the hrdtp.Just waiting to hear back on Danchuk when I can pick up a new floor and a new trunk pan.Oh,do I have to change the steering box also.Thanks if anyone can give me this info.I'm selling the 4dr.when I exchange the parts.
The 4dr. is a Ca. built Idaho car completely rust free.

[MikeKy55]

The steering box is the same all three years and all body styles.

[56nomad]

I am pretty sure the treadlevac bracket that bolts to the firewall is different. 55-56 are the same but 57 is different.