First, to make the loops you need some buckles. There are no buckles on the bag and there are no buckles on the belt. Second, where would you attach this bag to the 64 Pattern belt? After adding all the other 64 Pattern items to the belt, there would be no room left over to add a bag. At the very least, it would have to be mounted on the right side and forward. Not a good place to have a large bag. And, what would be the advantage be to adding a bag this large to the belt? The weight of the bag plus contents would make the belt sag to one side. It would be better to carry the bag on your back, as mentioned in Summers although this was a failure.
As I mentioned before, I also have the radio carrier with nylon buckles, and have also seen another version of the carrier that I have, NOS in a plastic bag with a NSN. As well, the last version of the 51 Pattern belt also had a nylon buckle.