waterpump pulley?

Many variables. Need photos. Early radiators (at least to 1969) had round tops. Most slants had a fairly thin fan, at least compared to V-8 clutch fans. I don't think there was but a single water pump for the slant six, but maybe in the Aspen/Volare years there was. I think all Mopar pulleys will have the same bolt hole pattern and center hub, thus would bolt on, so who knows what is on your car. For kicks, I even found my Mopar clutch-fan bolted fine to my M-B water pump using a spacer ring in the box, though the fan bumped into things.