• but it's quite pricey. does anyone know of any other bracket that could do a similar job?

    I'd be tempted to pop into a plumping supply shop and see what they have in the way of pipe brackets. If you could screw some solid C shaped rubber pipe grippers to the corners of the box. Then bolt a pipe bracket over the handlebar, pushing it against the rubber. You should get a good solid connection. I 'm not sure the steel section offers enough area though.

    This bolted to the steel.

    This over the top.

    Looking great BTW.

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