A '66 usually uses the other early disc brake with different spacing than my later built bike but they mount the same way They just call it part #165 "spot disc brake unit". according to the parts breakdown and part numbers I have the brake unit appears to have came with the 2 bolts and short sleeve spacers that go through the frame mount, if yours didnt you just need to make some little sleeve spacers so the caliper "floats" in the mount.
These should help but again the caliper and mount should be different (mount has a notch cut in it for the caliper to clear, the caliper is more triangle shaped)
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