Sorry gave some info on the 172 diesel. Here's some corrected info from the New Holland Parts site:
B3NN6055B LINER Sleeve, Cylinder Block, Finished, Prior to S/N 151245, 172", Years: 01/01/1953-12/31/1961
EAF6055D LINER Sleeve, Cylinder Block, Semi-Finished, Prior to S/N 151245, 172", Years: 01/01/1955-12/31/1961
The difference between the two is one is finished and the other semi finished. I would assume one is honed and one not.
They list only one pistion size for the 850. EAF6108F PISTON ASSY Piston, Pin & Retainer Set, Standard, 172" Gas & LPG, Start Year: 01/01/1955
At any rate, it seems you'll be ok with EAF6055D.