Although it has been mentioned a few times, just in case you don't know, Link STM is well know to be "the reference" tenor mouthpiece, but it is also well know to be very inconsistent in quality. I bought two, and both of them are not symmetric, and of course, I bought them before I know the quality issue and didn't check thoroughly. So, it is a recommendation to buy the Link locally where you can pick the good one.
Alternatively, you can try Vandoren V16 metal mouthpieces. I want to try one, but can't find it locally. I read several reviews saying they play like a Link, but with much better quality control. Just something I read on the internet, so, not sure how true it is.
Another popular choice is Berg Larsen, it has different combination of baffle and facing, but it never work for me.