Well i,ve been building this new ride a fit series one and all my parts from my barcode fit like a dream except the odessey giro

It will not go over the head tube

it must be that little bit thicker than the barcode's, so has anyone got a suggestion about what giro would fit it ?
The part that does'nt fit is the bottom part the one that you put on the head tube then put your headset cup on top , this is the only piece not fitting and its 1/18
