Pretty sure Dennis still has an exclusive with the Ron Davis Pantera radiator, I recently replaced his triple pass with his double pass and learned I could not buy it directly from Ron Davis.
The two SPAL fans that Dennis installs on his radiators are likely more than is required. They do in fact draw more amperage than the control unit sold by Jon Haas is ideally designed for. His controller can be used by putting the two motors in series, or another aftermarket controller can be used that is capable of handling both the high amperage fans from Dennis. There are no replacement fans with the same mounting footprint with lower current draw.
just something to keep in mind when you consider fans for whatever new radiator you purchase