[Walt Fricke]

These pulleys are pretty strong, so it should not be bent/warped. Nothing in normal operation produces an in or out force large enough to bend steel. Was the engine out of the car for part of those resto years?

Can I assume that you measured this because you could see a wobble? Given how close it is to the fan housing, 1mm might show up to the eye?

I'd be inclined to find a used one, with the deal being that if it, too, is warped you get your pounds (Euros?)back.

If you have access to a press, you might see about straightening yours. Straightening so small a bend isn't going to fatigue the pulley.