yeah, M12 is a bit big but the holes in the runners are 16mm so I needed to scale up to something a bit close that a washer would fit over properly without stretching
I've ordered some extra thick M12 repair washers (40mm diameter) which I personally think should be enough to go underneath. Even with the seat bolted straight to the floor with standard washers it feels solid and you're not aware of the flex in the floor pan getting in and out.
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