I think you mean something like this http://www.rodeo-labs.com/product/rodeo-spork-12mm-axle-conversion-kit/You could consider making something similar with a machine shops help if your current fork doesn't accommodate.
Nuts, I was trying to get registered quickly so you wouldn't go buying a whole wheel set =)
Enjoy the new wheels!
Supported videos include:
Please paste your code into the box below: