Downpipe options

Hello, I have a 1999 S70 T5 and the catylitic converter has given up the ghost. No real surprise after 348,000 miles. Can anybody please assist me with where to find a reasonably priced new or used downpipe for the car as I really want to keep her running. Are there other Volvo models pipes that would fit? Apologies in advance if thats a silly question.
As a footnote I also need another set of seatbelts for the coming mot, I bought a pair off ebay that the seller said would fit but they did not. :((

Nobody?:cry:

Does take a few days around here to get responses, but they'll come from some knowledgeable folk.