I bought a quarter panel patch panel that completely lacked the 1/4 inch reverse radius reveal around the wheel opening. The excuse from vendor was "the chrome hides that anyway". Well, not all of these cars had chrome. That is not a good explanation for crap workmanship. The same panel for the other side from the same vendor two years earlier was just fine. It depends what you want and what you expect. The best is if you can see the part first hand, say at a car show where they sell parts. After that, it will be handy to have skills to lengthen or shorten panels to fit, because unless it's original GM, it's not gonna fit right. That is why body shops don't take restoration work anymore. The can't set hours to a job when parts won't fit up.