My son managed to put a bend in the left side axle on the 300ex, I was wondering if I can swap out another model axle in place of it, will a 400ex or a 450R axle fit in the carrier? I imagine both are a bit wider than the 300, which is fine, I run spacers on the back anyway. So is a 400/450R a direct swap, or will I need parts from the donor axle quad? thanks for any info !!