New OBX/Forza catback trouble

[Mike4d]

I got totally screwed by the Ebay store Sparktec Motorsports, (Don't ever buy anything from these crooks) I bought an OBX/Forza catback(R-EX92974) from them for my 97 civic LX (as they advertized it would fit) and after dismantling my entire exhaust system, discovered that the piping came up short.
After countless unanswered emails regarding the issue I gave up on getting any help from them. I did a little research on other sites selling the same catback and learned that for the 96-00 LX sedans it was selling along with an extension, part # CAT101A.
I am pulling my hair out trying to find this part. I have found part # CAT101 without the "A" on Ebay and have yet to get a straight answer from any of the sellers as to whether or not this is the same part or not. If it IS the same then I will be using a highflow cat to bridge the gap, would this work? I would then have TWO catalytic converters? Is this my solution or do I need to buy a new header AND cat to be able to hook this thing up? Or is CAT101A a different part, not a cat but simply an extension pipe connecting to the stock cat?
I am at my wits end. Any help from anyone faniliar with these parts or has any knowledge what so ever on this problem would be GREATLY appreciated. I'm going insane with this mess.