Need correct crank pulley!!!! Any ideas?

The typical lower crank pulley for manual steering has one groove & about a 6 1/2" diameter.

This aftermarket cast iron pulley was part of an AC system added to a manual steering car.

Same outer pulley diameter.

So if you really want a dual belt system, this may be one way?

It does have the offset bolt holes for the older crank dampers, I just pulled it off a '70 last week.