FYI - Haha - not a troll...why would anyone troll THIS site?!! You presumed too much, therefore your logic was incorrect.
Here is the back story:
I am restoring a woodshop by a famous architect. He had an old Magna tablesaw. That company was bought by Shopsmith. I bought an Incra 1000 to fit that and it would not work. I had the old miter gauge and bar and, of course, the tablesaw. But I had no calipers to measure with. I called Shopsmith and, unfortunately, got Krista. She said the measurements were proprietary and would not tell me. She also said Shopsmith changed everything Magna had - which seemed unlikely... why would you change the miter slots on a casting (or machining) just for fun? Disbelieving, I looked and posted here AND called and got another, competent, guy at tech support who confirmed Krista was incorrect and the shopsmith miter bars will fit - as will the Incra version.
I thank you for posting the images of the slot. I would ask that you note the model that slot is on as it varies on at least two different Shopsmiths...
I will now leave you to your toys.