Why not just make one? Fairly simple.
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There are a number of helpful posts on this forum about making mylar belts that are perfect for your Teres. A simple search for "mylar belts" will get you started.
Some of the posts will even talk about improvements you can make to the belt by using etching cream to remove the coating on the mylar.
Once you get the hang of it, it's very easy to make as many belts as you'll ever need. I've made 10's of them for all the Teres and Galibiers I've owned over the years.