I needed a catalytic converter for my 2005 Altima....

I needed a catalytic converter for my 2005 Altima.I looked at some on Ebay and saw several different manufacturers and several different prices. I decided to go with Rockauto because I felt I could trust them and their products. I was wrong the converter that I received did fit the engine and the exhaust pipe, but it did not have a bracket to properly attach it to the engine block and the heat shield could not be mounted. The converter also had two holes for the oxygen sensor when it should have had only one. The mechanic installed it and now I am out 200 plus dollars and probably will have to replace it again. I won't trust Rockauto again.