Unique to these old Hondas are the hex and thread spec. So, did also buy a 10mm metric fine tap and die set.
Made the 2 top and 4 bottom engine bolts complete with nuts.
Like a lot the sharpness of the edges and left the nut and the bolt head depth on the large side. Reminded me of my grandads home built steam models, so that's a good reason as far as I'm concerned.
Almost too sexy for my bike......almost!