Identifying my power steering pump

[62 Dart Convertible]

Hey Guys

While I'm ordering so many parts for my car, I thought I would order a spare power steering pump for just in case. From the info I found, I know I have a Thompson (or TRW) pump, but there seems to be several different variations.

Using this link - http://www.cardone.com/find-parts/vehicle-parts-listing?make=Dodge&model=Polara&year=1962
I see there is either the hex or plain shaft difference which is obvious, but what would be the difference between 318/exc 318 models?

I can't be sure my pump is the original to the 413, or if it was a 318 pump to begin with unless somebody can tell me how to tell the difference.

Anybody able to fill in the blanks?

 

[clemul]

Maybe matching yours to the pictures on this site will help:

http://www.steerandgear.com/Chrysler_Catalog.html#TXTOBJ7DB1219F302938E0

You can always call them and ask them and they do quality work...

 

[62 Dart Convertible]

Thanks for the link and info.

Helps add confusion too as they list 2 different types of TRW pumps, Cardone list 3 ?!

Their list of power steering hoses is like so many parts suppliers too - it's as if there were no B-Bodies in 1962.