Take the basic malts and throw them into BeerSmith of Beer Tools Pro and massage the amounts until your gravity comes out. Or, take the specs to your LHBS and play "stump the shopkeep" and see if he can put something together for you.
Also - as a little bit of local knowledge - if you're in the bay area (Moylan's is in Novato) go to LHBS in Santa Rosa - The Beverage People (http://www.thebeveragepeople.com/) - and ask for Gabe. He used to assistant brew at Moylan's and I'm sure could help you nail it. If you're not in the area, call them. They put together kits if you ask them nicely and Gabe could probably hook you up with something pretty darn close and ship it out.