Looking for Power supply for P4T MB

I have an old Asus P4T MB that has 3 power connectors. Standard 20 pin ATX, 4 pin power connector and A 6 pin AUX power connection.

I can't seem to find a Power Supply that has all 3 of those connections. I find those that either has the 20 pin and 4 pin ones, or the 20 pin and 6 pin AUX one. Is that Aux power connection necessary? What is it's purpose?

Looking at the manual for the mobo it makes no mention of an Aux 6 pin power connector, however if you need a psu with all three connectors pc power & cooling will add any connector you need to any of their psu's for a small charge.

See attached pic. I'd rather not go the pc power & cooling route (too expensive)

You should be able to buy a molex to 4 pin converter.