mysticteal2kz28

Hello, I am wrapping up the first T56 rebuild and I got a question on the T56 tailhouse bushing. The T56 I got has approximately 110k miles on it when i started the rebuild, I am swapping an A4 for an M6, so i don't know if anything else about this transmission other then mileage.
My question is how do you know if you need to replace the tailhouse bushing? Is it something you replace on a typical rebuild? Where do you find the replacement, Tick Performance has a Rockland "no walk" is that the only replacement?

Thanks for the help!