Found these at Wrington engineering , Good replacement for standard.

some good ones here as well,

http://www.ebay.co.uk/itm/Set-of-5-Range-R...rmvSB=true

I work with stainless, so just be wary of using normal stainless for stressed area's.

I would of thought the normal wheel nuts are 8.8 hardness, or even 10.6................ Stainless steel ones are rarely hardened, and are usually marked A2 (304 grade) or A4 (316 grade).

Stainless also binds easily, and if it does you will end up with a nut that can neither be tightened or loosened.

I just hope they are rated for the job.

Good luck.