Water Pump on 76 C10 350

[HBlue]

I assume the water pump on this truck is original because it is painted orange and the truck only has 51,000 miles. The first pump I got from the parts store had a threaded bolt hole for the PS bracket, but the original is not threaded.

On the next one they had, the PS bracket bolt hole was not threaded, but the alternator bracket hole was located about an inch further toward the front. This means a different water pump or a different alternator bracket.

They got off the computer and into an old stack of reference books and finally decided the 76 water pump was different. They should have another one Friday or Saturday.

Anyone else have this problem?