Oh come on... you don't really want us to spoon feed you all the answers do you? Go and look at how a standard reel belt is mounted and at your build around RS5/6/7/7A and where SB1 joins to BR12 or where SB1 joins to SB3.....
I'm sure you can work some thing out from that.

Haha yes I do.
Found the bit in the book on page 119. It seems as though the donor reels can be used. I was expecting to need new items with some sort of type approval.
I will also check through the IVA manual

Fairly sure the dimensions/picture for roll bar have brackets fitted to top corners for inertia reels to be used.:p