The Carlyle water supply has to be at least 7" "center to center" from the center-line of the toilet.
The Carlyle II water supply can be 6" to the left of center
The Ultramax and Ultramax II can be 3" to the left of center.
If it is too close, it will hit the back of the toilet.
In some cases, I have removed the stop, and soldered a 90 el with a 2" piece of copper pipe to move the shutoff from behind the back of the toilet.
If the water supply is closer than 7" and moving the supply is more work than you want to do, then in most cases, the Ultramax will drop right in.
Terry Love's shopping cart
Dahl makes a shutoff that is tighter to the wall for this situation.