http://www.concoa.com/docs/catalogs/ADC3022K_Cutting_Welding/Special%20Use%20Regulators/ADC3022K%207000%20Series%20Regulator.pdf
I found mine listed on ebay (where else) for a very good price - not sure how much they are from the distributor. Some slight plumbing is involved in the change over but very simple using hardware store brass fittings.