My flat top 26's grill grate measures 24 13/16", or just a hair over 24 3/4".
The maximum allowable space in the bowl while still sitting on the straps appears to be just under 25", and the discontinued GrillMark 25" was just under 25", which is why it was a good flat top fit. The Craycort is 25", so a tight but doable (and available) fit, but CI isn't my first choice.
I've read that the SCG's cook grate is somewhere between 24" and 24.5". Either could be made to work, but I hope it's 24.5" obviously.