Most F1's use non flanged for front. For the rear it doesn't really matter whether its flanged or not.
You will want for the front any Nylon locking M4 non flanged nut. It doesn't have to be an X-ray brand, its just common hardware, lol.
Got it thank you. they all seem to be made equal, from what i can tell. Unless xray has superb metal from the gods but hey.