I bought a 520 GMC in Cawker City, KS. I've been looking for one of these for quite a while.

https://plus.google.com/u/0/1126369...0762756002&oid=112636930370126476644

This one has straight air with the old style bolt together brake chambers. Most of this model were born as fire trucks with hydraulic brakes. I picked it up myself because I used to run that part of Kansas a lot and I don't know if I'll ever have the opportunity to go up there again. These guys comb western Kansas and Nebraska for 50's and older stuff. I was amazed at all the rust free stuff they have.