Harnesses - buckle type

[londonsean69]

OK, next question (I'm being prolific recently)

I'm not too sure whether this should go here or in the IVa/SVA/legal bit, but it's here now

Is there any rule on what sort of buckle may be fitted to a harness?
I have had a trawl of the IVA manual, and can't seem to find any info on buckles, apart from;

Section 31 - seat belts

6. The lock mechanism must securely lock the belt
7. The lock mechanism must be able to be released easily, both in normal use and when the belt is under load.

The reason I ask, is that I seem to remember a few people on Locostbuilders were failing IVA because they had the wrong sorts of buckles (rotary as opposed to aircraft)

As I intend on 5 or 6 point harnesses, I think they all come with rotary. Am I going to need some 4 pointers just for IVA?

Cheers

Sean