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Detail of the holes from the outer-dome attach bolts around the periphery of the LOX dome, where the LOX dome would be bolted to the thrust chamber. There are 64 such holes.

Each hole appears to be numbered, although I'm not certain as to the significance. The three bolt holes fully visible in this photo are numbered (from left to right) "60", "30", and "56"; the partial bolt hole at right starts with the digit "2". I suppose that it's possible that the bolts should be tightened in a particular order, not unlike the star pattern when tightening lug nuts on a car.