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I would not oversize the hole and the shock bush (the bush in the shock will become hot and may destroy any rubber between it and the eye on the shock).
Rather make a top hat bush bored 10mm, shoulder 12 or 13mm diameter and the same depth as the aluminium lug with the oval hole with the brim c20mm diameter and 1 or 1.5mm deep. You may also need a 1mm or 2mm longer shock bolt
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