The classic 5 chainring bolts are universal, except for length, ie for single, double, triple. Some low end cranksets come with slightly shorter than standard bolts to accommodate their thinner steel chainrings.
Granny mounting bolts are less standardized with a few different ones in use, so watch yourself if buying replacements. Campagnolo also uses a special bolt along with 4 standard ones on cranks where the crank doubles as one arm of the spider.
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