I just bought a NOS hinge from a dealer for $125.00 so I have something to compare the original channels to. I still plan on rebuilding my hinges, but when I get through, if somebody is in dire straits for a hinge and I get both of mine perfectly, I'll sell the one I just bought.

1951 1/2 ton 3 window
1949 Suburban
http://gallery.mac.com/patrick.plummer#100287&bgcolor=black&view=grid
http://gallery.mac.com/patrick.plummer#100501&bgcolor=black&view=grid