I think I used a 3/4" or 7/8" spring in mine and cut it down to the appropriate length. I heard the valve spring was too much pressure and not neccessary. I got mine at home depot in the hardware department.
I'm far away from any good store here and just want to make sure I have what Ineed before I rip the front axle apart. If a typical chebby spring of 1.25 OD will fit, my 30mm spring is a lot softer and good enough.