Water pump I.D.
Alex,
Let me try again

. ALL the pumps I have are 101 and 105. 1600's Papajam is , as always correct. He IS the "PARTS MASTER"

. If we refer to after market pumps, you will see Centerline has a WP502, WP512, and WP513. All different. The 502, is the one hanging in my shop, the 512 is 1750, 2000, 69-74, Spider through 89. The 513 is Spider 90-94. If you will use one of these {512} in my catalog it's an $86 part.
It would be wise to phone them, or E-Mail and get a positive I.D. on the pump you have.
In the early 70's, I built a CHEATER 1600 that was a disguised 1750 Veloce, 40DCOE Weber engine, complete with 1600 Veloce pan, and, as I remember it, water pump, as it ran a Bosch generator. {I DID NOT USE STEROIDS!

) Clearly, a while ago, I no longer remember the particulars of the water pump, but the currently available after market water pumps were not available then, so with budget race cars, it was a question of "Let's see what FITS"

.
Your OEM Alfa box does not go with the after market pump, at least here in the U.S. Does this help, or add more confusion?

Gordon Raymond