Are you thinking the Y plates? I had some made. Never had a need to increase height, so I didn’t change that. I was going to try some mods, but I was under a time constraint. Only thing I really changed was to add a slot for a potential external belt clamp. Happy to share the file.
I misunderstood Will’s comment to mean the front and back bent steel supports. I noticed that the ones on my XXL are taller than my original SO3. Maybe the newer SO3s are taller and that’s how @Vince.Fab has 4" clearance.