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Found some bits and pieces while I was tidying up, don't know if this helps you at all. The square bit is a blanking plug for the plate, and it's the same size as the end of the junction box. I can't measure how long that is because I'd have to unwrap my handlebars. It looks as though the hole in your frame isn't wide enough.
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Looks like this. Hole is around 3.5x1.5cm and 4.5cm deep.
Comes with a clip on cover like this that I would cut to put the junction box into. If it all can fit.