Hello, Dad and Son,

Most likely, these are the parts you are trying to match up:
(if these are not your parts, please post links to your parts, or part numbers)

Chevs of 40s Short shaft water pump

Classic Parts 1955 fan blade
17 5/8"" diameter fan with 11/16" inch pilot hole. Fits 1955-72 6 cylinder and V-8 with short water pump. **(NOT FOR HIGH PERFORMANCE ENGINES OR FOR USE WITH THE SHORT SHAFT WATER PUMP)**

Here is the 47-53 fan blade
15 3/4" diameter fan with 1 inch pilot hole. Fits a 47-53 216 only.

What engine/year fan belt pulley will you be using?
- what width belt?
- what groove-widths do you have for your:
-- generator pulley?
-- harmonic balancer pulley?
-- fan pulley? (and, fan pulley-diameter?)

Maybe someone else can help you.
Since you have already bought your parts, it does you no good to be told that there were other ways to do this.