Yup i was thinking that, the cossie brakes would likely not fit the the standard hubs.

I was reading about the rear setup, there will be issues with the trailing arms if I want cossie stuff but I think i can get away with just putting in the cossie diff and leave the rest the same, will have some work to do there I think, need to look into it a bit more and see what brakes i can fit to it.