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any off the shelf x-pipe (with the appropriate diameter pipes) will work and any good exhaust guy can weld it up for you. It's not like you have a bolt-on option regardless of if you are replacing the x-pipe resonator or the secondary cats.
I recommend you get the resonated x-pipe replaced since it seems to be a source of failure in the exhaust system (broken welds internally) ... Replacing secondary cats is at your own peril since it's technically illegal.
Just note, losing the resonator moves the tone of the exhaust a bit higher. Losing the cats will definitely change the sound. Either option can easily make the exhaust sound worse by introducing unwanted rasp/ popping and such. Straying from ready-made systems that were supposedly tested together is a potentially expensive experiment.
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