Due to the previous owner of my car, the midpipe of my exhaust is all welded in. I managed to replace the catback, but now need a catalytic converter. Found an ebay seller and he told me to tell him what's the length I need and the size of the piping. This is for a magnaflow universal fit.

Can someone tell me what's the stock pipe and length of the converter I should order?

Car is a 91 CRX DX. Thanks