Help working with wheel arch replacement

[Lazste15]

I have purchased two wheel arches from a company in PA. Well they are not even close to fitting/aligning on the bottom of the side bed. Who is the best supplier for sheet metal replacement wheel arch for a 1977 Chevy C-10 long bed. Please help. New to do sheet metal work. I know I have two of the same parts I ordered from the same supplier and they are not the same part. The one that fits has a cut out for the lower support rod in my wheel arch, one doesn't. Who can I buy from and make sure I will not have a problem.
Steve

 

[idahovette]

AMD.....Help him @TotalyHucked ,Zach

 

[TotalyHucked]

Hey Steve, throw up some pictures to help explain what you're running into. I work at Auto Metal Direct and have our wheel arch trim on my '85. Other than a small amount of massaging by hand to get a nice tight fit (they're soft aluminum, easy to manipulate), they fall on the truck.