Voltage reducing resistors for reducing 12v to 6V to use for fan motors are ~ $5 on Amazon ....
Just another option to the one you provide.

VISHAY DALE RH0501R000FE02 RESISTOR, WIREWOUND, 1 OHM, 50W, 1%

Attachments
resistor.JPG (13.36 KB, 63 downloads)
resistor