Has anyone bought and fitted the Arrma Metal roof on a Radier 1/10 Brushed? I ordered this from Tower Hobbies: http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXEAUU&P=7 Problem is the original plastic roof has tubes through the underside that allow it to be screwed in from either side of the roll cage assembly. Seeing the metal roof comes with four holes machined through the top, it would've come with a set of cross bars to screw down into. The Arrma parts site indicates that this is a valid part for the kit. Anyone found a part that enables the metal roof to be fitted?