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@plinth
Do you mean the allen nut that threads onto the bolt on the back of the brake calliper doesn't fit through the hole in the forks?
If so, just consider drilling it yourself. I'm not an engineer or mechanic, and I recently drilled out the back of my forks to accommodate a Tektro R536 front brake. My frame only cost a quid off eBay so I wasn't too bothered if I screwed the whole thing up, but it went pretty well and the calliper now fits perfectly.
I say 'pretty well' because I knackered one drill bit and a second one is looking a little less sharp, but the forks are pretty thick steel. Make sure you use a mains-powered drill (cordless won't cut it - literally!), a decent HSS drill bit (usually 8mm, but check by holding it up to the allen nut), regularly douse the hole with oil or other appropriate lube (not K-Y), and have a steady hand, as a twisted hole will lessen any stopping power from the calliper.
What frame is it? What's the material? How sturdy are the forks?