the "toliet" smooth bellows off of ebay
......I had to heat mine with a heat gun (industial version of a hair dryer) to make it stretch a little and fit on my TB. Once you make it fit its really nice (no ribs). I seem to remember people saying to put a glass bowl of water in the microwave and get it boiling. Then drop the rubber piece in the water and let it get really soft. With it soft you can just push it on the TB (using gloves/oven mits), let it cool (can poor cold water over it if you don't want to wait long), and then it will be a perfect match.

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It's a Fernco collar for plumbing. I paid around $3 at Home Depot.
There are the F-car specific parts for $40-$60 and there are the diesel (semi truck) air collars for about $12 that fit better. But for the price of the Fernco, I won't complain. I doubt it does much, but it certainly has to flow air smoother than the stock part, so it can't hurt. It sure looks better.
My .02
Dave



