Correct Water Pump for Early 273 w/ AC

I have had much better luck by buying remanufactured water pumps.

Your original pump is what I have on my AC 68 car and also what this auction shows for a factory water pump on an AC car.

http://www.ebay.com/itm/1968-1969-D...Parts_Accessories&hash=item22fe83295f&vxp=mtr

Educate me. Is the pump I bought a new casting, as opposed to a casting from back in the day?

How can you tell the pump in the eBay listing is correct for a 65? The listing says 68-69.