ALT 279 LM rep rim bolt size?

[deutschman]

I'm not sure if I am using the correct terminology here, but I need to know the size of the "rim bolts" for the ALT 279 wheel. It's a BBS LM rep.
These wheels are for my girls R53 Mini S. It is my first time building a set of wheels so I'm new to this.
Does anyone know what would fit?

[deutschman]

well this turned out to be a dumb question.
the guy on the phone told me, after i specifically asked him, that these were indeed 2 piece wheels.
turns out they are not.