I'd make sure to get a bolt with at least the same "property class" (as they say in the metric world) which is the strength rating such as 8.8,10.9 etc..It should be stamped on the head.And follow torque recommendations.Lower rated bolts tend to be softer and twist off easier.
Generally it's OK to go up a grade to a slightly stronger bolt but in applications where it's made to fail before other component damage occurs or for safety reasons, it's imperative to use the correct grade bolt.