Mine is notched for the stroker, but didn't need it because scat said I beams don't need it but they did say it was needed for h beams but that was a different brand..
I “think” it usually comes down to the type of fastener used. Factory style stud/nut requires notches where as cap screws do not. Just what I’ve seen so far.
Edit: I’m speaking about 4” stroke combinations. I’m sure other strokes will differ.
