This is copied from elsewhere on the forum:
Nudge bar bolts
4x30mm M10 High Tensile (8.8) Bolts to fix bracket to chassis + 4x Spring washers + 2x nuts 4x35mm M10 High Tensile (8.8) Bolts to fix bar to bracket + 4x Spring washers and 4x washers and nuts. This was on MY15 GLX-R
If your M10s aren't fitting maybe it's just a question of thread pitch. I'm not sure which is standard but you might have 1.0 and it might take 1.5 for example. Just take the one that doesn't fit to bunnings, work it out with their thread board thing and then buy the other pitch and try that.
These instructions are not for the genuine bar but should help anyway since they probably use much the same holes etc
http://www.egrauto.com/sites/default/files/SK567%20-%20TRITON%20CHALLENGER%20LL.pdf
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thing 1 and
thing 2.