The original front cylinders will have the following casting number; 5454385 and were p/n 5455482...7/8" piston
There are two rears listed...
Casting number 5454251, p/n 5454313 with one 7/16-20 hole and one 3/8-24 hole.
Casting number 5454251, p/n 5454314 with two 7/16-20 holes.
Both rears have 1-1/2" pistons.
Hope this helps,
Mike B
