Seat Belts for IVA

I am planning on buying a couple of Sabelt 4 point harnesses with twist buckle. I am pretty sure these are OK for IVA (the belt is FIA approved) but thought it worth checking whether anyone knows why these wouldnt be acceptable?
Thanks
Ian
 
I'm a bit out of date on this as my car went through SVA however as I remember for the SVA the belts had to have the lower standard 'E' markings which most of the FIA items don't have. There should be specific details in the current IVA manual.
 
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