Thanks guys, I had bought a Campagnolo Veloce one that wouldn't work. I think it was 40-42 mm if i can get one in the low 30s it should be fine. I think i will get the cheapest low stack one i can find and if it works get something nicer.
Just to confirm, i should measure the head tube and add the stack height. then this should be the same/shorter than the steerer tube?