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Update - Took a second look at the toolbox through the lens of just a bolt attachment, then took another look at the rack mountings. Realised that all I needed was a right angle, and I could hang the light off one of the bolts going through the bed of the rack.
Never throw away the mudguard mounting spares, that's all I'm saying.
Sorry - dark photos that I can't be bothered to edit this moment.
Ha, I would shim but its actually not possible. Once you come to fit it, you realise its an awful design where you have to clear your bars of everything and slide it on from the end - a two part clamp like an out front garmin mount would be so much better.
TL;DR can't shim cos I can't slide it on the tubing.
Pretty sure this another light model, but nicely done.