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That's interesting. We all know exhaust parts are aluminized, but for the most part Didn't occur until the sixties, probably late sixties, then pretty much became the standard. I can see were later replacement parts were treated, but I doubt the Early original trucks were. When the first M37...

The NOS parts I believe were painted for storage protection? With such a beautiful rebuild your doing I would find some high heat Enamel in a darker silver, or Gray, flat black, or whatever you like, and squirt it. Tom

They were originally bare metal, and quickly turned rust brown. Tom