I use these. Been great. Cheap and cheerful however you might want to use STEEL Bolts and not Aluminium. I use Stronglight Steel Bolts. But the chainring works fine and is still going after a year and a bit now. Enjoy. https://www.google.co.uk/search?client=safari&rls=en&q=brev+m+chainring&ie=UTF-8&oe=UTF-8&gfe_rd=cr&ei=pSNyU47qGIO6jwfhyoGIDw#q=brev+m+chainring&rls=en&tbm=shop
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I use these. Been great. Cheap and cheerful however you might want to use STEEL Bolts and not Aluminium. I use Stronglight Steel Bolts. But the chainring works fine and is still going after a year and a bit now.
Enjoy.
https://www.google.co.uk/search?client=safari&rls=en&q=brev+m+chainring&ie=UTF-8&oe=UTF-8&gfe_rd=cr&ei=pSNyU47qGIO6jwfhyoGIDw#q=brev+m+chainring&rls=en&tbm=shop