Seeking a Source of M 10 Nuts .

I'm chasing a small quantity, no more than a dozen, of new M10 x 1.5 nuts that measure 17mm across the flats. I have plenty that measure 16mm and I have found an eBay seller in the UK who has 17mm AF nuts but I was wondering if anyone knew of a local source.

The nuts need to be either black or unfinished. No stainless, zinc plating or hot dip galvanised finish.

Bob.