im trying to find the right part number for a body nut screw. this is the most common nut/screw combo on the car, the ones used all over the front fender guard and brake ducting. for example, piece #4 has a couple

however, the part drawings for the fender liner arent updated for late model cars, and i dont know which nut is the right one. there are a bunch of different choices:
st4,8-1
4,8
st4,8-1 ZN
what does this mean? which one is right?

however, the part drawings for the fender liner arent updated for late model cars, and i dont know which nut is the right one. there are a bunch of different choices:
st4,8-1
4,8
st4,8-1 ZN
what does this mean? which one is right?


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