Hi guys!

I rebuilt my '73 K10 about 30 years ago and put on some cheap chrome wheels. Now I want to change back to the original wheels, but it has been so long that I can't remember if the acorn type nuts that are on there now are the original ones. I never throw anything away, so if they are not, I don't know where they are. If they are not the original ones, can I use them anyway? I want to make sure that they do not bottom out on the wheel lugs.
Edit: If I have to get new ones, what size do I ask for?
TIA,
Brady