402 water pump questions/advice??

[painterljp]

Rebuilt our 402 bb. Now for water pump??? Ordered a flow kooler water pump bra- 1673. It is the wrong one it won't bolt. It has a short water pump. We have the old one. It looks same but bolt hole are definitely wrong. Called Summit. They are returning it ok. But they asked me the dumb questions of which way does the motor turn clockwise or counter clockwise.?? Guess I don't know and the engine is still on the engine stand and not yet installed . Summit says the one we got turns clockwise and it won't fit. They Gave me another number of a pump that turns counter clockwise of EMP11105. which is a Stewart pump and it turns the other way and they say it will fit. Now am really confused. Help!!! Only thing I seem to find on here is standard rotation. It is a completely stock truck. Anybody got any part numbers for the correct water pump.? It's a short pump.
And when you look it up to cross it it does have 2 different models of 6.6 402. One with a T and one with a U. Is that a Vin or engine block code? I think am over thinking this stuff.
Thanks in advance for any answers. Didn't think I was this confused but guess I am.