Cheap headers...

That's what you get for buying shiny stuff lol, no really that sucks. You should just get your headers coated, at least you know for sure they fit. I had cheap hedmans on a dart and they got flattened so I bought a set of summit/flotech headers and they were slightly different and would not bolt up to the exhaust system. Its a crap shoot with changing brand of headers.
Yeah I'm going back to plan A and just buying a $12 can of black silicone spray and repaint them...