H3 Hood Handles

[OZH3]

I have Just purchased Chrome H3 hood handles and they said they came with hardwear to fit but they seem only to have bolts with alan key holes to srew into the handles through the louvre at one end, not nuts so what stops them from pulling out or am I missing something. Can anyone give me a blow by blow way to fit them as they are suposed to be H3 handles but came with no instructions and they are real heavy so I don't want them to come flying off.

Thanks