If you have trouble finding the item or it's too expensive, check with repair facilities that do exhaust parts.
Even for larger items (like the rear engine muffler), my experience is that these specialized repair facilities will "repair" your item, regardless of how dilapidated it may be, and return to you essentially a new item. They'll use maybe a clamp or a tiny piece from your old item and use new items for the rest, and that qualifies as a repair under their FAA repair license. I suggest you get a recent Trade-a-Plane, look for the several display ads from exhaust system repair shops and call them. I think it may be 1/10 of other alternatives.
I cover this and other cost savings idea for parts in my "backup" Skymaster website at
www.SkymasterUS.com
Ernie