Mcmaster does not have any metric aluminum acorn style nuts. I'd love to know if there is a European equivalent to McMaster. That would be your best bet. If not that then you'd probably have to have them custom machined and that would not be cheap, probably $100 at the very best. If you find or get them made from aluminum you could have them anodized at a local plating shop. Many plating shops "your" machine shop and you need a sample for your customer and pricing in quantities of 100 and 500. Not entirely honest but it is expedient...
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