Rusty Cab repair

[magooster]

I have a '65 GMC with an extremely rusty cab. I'm in the process of trying to find a nicer cab but if that falls through I'm going to order every possible patch panel available and weld em in. Of the parts readily available it needs cab corners, outer rockers, inner rockers, rh and lh floor panels, and cab supports. My question is this: Does any body know of any companies selling patch panels for the front of the cab? specifically the portion below the firewall where the bottom of the fender bolts on? Thanks in advance