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I had a set of them but lost 1 and I couldn't buy a replacement so sold them on, without a doubt the best looking nut and the colour is even better in the flesh.
Off eBay and from the USA, although I did find some UK sellers for Muteki wheel nuts later on but I'm not sure if they had the burning blue type in stock.
I think Sumo power may have been one of the UK agents I found.