Wow, sorry no one has responded to you.
Apparently the CAD files for the IQ rack gears aren’t working, but in the meantime I can give you some dimensions for the V5 sliders (so you can measure your IQ rack gears):
I can try and see whether they fit later today, but my intuition is that it won’t. If I remember correctly, the V5 sliders is at a wider width so they wouldn’t be compatible (I think?)