Ordered new catalytic converter pipe and flange ga...

Ordered new catalytic converter pipe and flange gasket from diagram on Rock Auto. Thought I was saving at least $100 over competitors until the I tried to get them installed. Installer (MIDAS) showed me where the flange on RockAuto supplied pipe was too wide for the exhaust manifold. Then the hangars were 2" too long and had to be cut, shortened, and welded. Then, the flange gasket diameter was 1/4 too big. NOTHING FIT. The flange had to be heated, bent, and then with the force of 2 mechanics pushing up on the flange bolts, only then did it all fit. Thanks to all the modifications that had to be done to the catalytic converter pipe and the correct flange gasket from a local parts store, the $100 savings cost me $247 in modifications. MIDAS verified per RockAuto website and diagram that I ordered the correct parts from RockAuto. When I went on RockAuto website to get at least a partial refund and alert them to the poor quality and fit of the part, I quickly found out because I installed their poorly manufactured part, it was unreturnable. I had not choice to modify and install it since my old exhaust was removed and rotted. So then I tried to call RockAuto. Good luck..its all online, absolutely no one to talk to, so I'm out $247 in labor for a part that didn't fit as it should. I hardly ever write online reviews but this is the only way I can warn you about absolutely no customer service and horribly made parts at RockAuto. I would strongly NOT recommend RockAuto!!!