NOI551

Hey all, So I'm looking to get some extended wheel nuts to suit the new wheels going on my FG XR6T. Whenever I try look for wheel nuts to suit, all I'm reading is that the only size that will fit properly is a 1/2" However, nearly all the wheel nuts that are decent looking, and are of decent quality - are like M12 x 1.5 Will those fit? Or do I need to look for specific nuts that are 1/2" Cheers!