if you can wait there are some on ebay
http://www.ebay.co.uk/itm/M20-X-1-5-X-EXTRA-FINE-THREAD-PITCH-HEXAGON-HEAD-SET-BOLTS-40-45-50-60-70-80-/331706299100?var=&hash=item4d3b3c72dc:m:mBfNbLLm3CgpaM_CJZICkcQ
