Ok found a sleeve between my stuff, a shimano one and the girth thing does not fit in the middle of the sleeve. So i had to improvise and i cut a piece of plastic from a plastic bottle, and joined it together with some tape. Done.
So far so good but i wont know for certain until i put the crankset in the frame, maybe tonite.
Wonder if the sleeve of a shimano external cups BB will work, it might the issue is to find one.