Sheet Metal sources

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Sheet Metal Sources
I know there are other threads out there, I just can't seem to find them.

My '57 3100 will be going into the shop soon for an extended spa treatment. The cab sheet metal is in good shape, but needs a few changes like the correct hood and grill (has a '55 or '56) and my wife keeps bugging me for a big rear window conversion.

I know there a lot of different companies out there selling sheet metal, but I assume there are only a few companies that actually produce the parts themselves. I'd prefer to use a site sponsor if possible and don't mind spending a bit extra to support the site and for good quality metal that requires less prep and good customer service. I'm looking for heavier gauge sheet metal that is easier to work with. What vendors do people recommend that meets those requirements?

We're actually in the process of relocating to Northern Arizona so sources that are close to reduce shipping costs would be a plus.

Thanks,

Ron