Cat 3126 rear main install tool

I'm going to have to put a new rear main seal in a cat 3126 sometime in the near future. When I get tired of it puking oil on the ground.

A guy local to me has this on Craigslist- is this the only tool I need, or do I need another adapter? Seller states that it does 3126- but I don't know.

I have a seal install tool for a 3208, I guess I should look and see what part # it is.

https://springfield.craigslist.org/tls/d/mansfield-cat-rear-main-installer-kit/7096502668.html...

Cat 3126 rear main install tool