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why you simply wouldn’t just drill both front and rear out to 8mm
You want to leave enough 6mm hole on the caliper side to stop it flapping about. That means you have to drill from inside the rear triangle, which is tricky, and you might not have enough metal to do it anyway, that top hat inserted into the bridge can be quite thin walled
If you have Allen key brakes, fit the front one on the back with a nut and drill the back of the fork crown to 8mm so you can fit the rear brake at the front with an extra long tube nut