Thread specs are 12mmx1.5mm.
Genuine part number is N90635001
Possibly may have been undone for engine removal. Honestly, once you've pulled a few motors out of these, you soon work out what you can leave in. You can leave the rack, struts and hubs still attached and in the car. So may have just been someone unfamilliar with the product, and slightly careless. Worth persuing with the repairer, though.
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