Duster exhuast tip question

I am planning to install 71 exhaust tips on my 70 Duster and get rid of the aftermarket tips that the previous owner installed. One question that I have is on the size of the tip inlet pipe. I have what appears to be 2.25" exhuast pipes. Should the exhaust tip inlet pipe fit inside the exhuast pipe or go on the outside. The service manual makes it appears as though it fits inside it. If so, then do I need 2" tips. If it goes on the outside, then I guess I need 2.5" inlets on the exhaust tips.

Who do you guys recommend I buy the tips from? I know that Ebay has a lot of them posted and all the big resellers do as well. I just bought an NOS set off Ebay and they don't look good so I am returning them.

Any feedback would be appreciated.

Thanks,

Jason
[email protected]