I measured it again, my caliper pulled out a ring of dried up crud and now an M6 bolt goes in there. I feel such a fool. If it's M6 then for the other side I can dremel a bit off a spare brake caliper nut so it's short enough not to stick out.
Thanks all.
@Five-Hats started
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I measured it again, my caliper pulled out a ring of dried up crud and now an M6 bolt goes in there. I feel such a fool. If it's M6 then for the other side I can dremel a bit off a spare brake caliper nut so it's short enough not to stick out.
Thanks all.