NOS Lugnuts 10xL and 10xR
To be honest I don't have stock studs. I'll check it out though.
I've just confirmed that they are in fact 7/16". I have some 1/2" lugnuts with 1/2 stamped on them and these are smaller. A 7/16 course bolt does thread right into them.
I guess this link would be a better representation of them.
1970s Plymouth Dodge A-body NOS MoPar 7/16" Chrome LUG NUTS Dart Cuda Duster Set | eBay
Price reduced to $80 to reflect the size difference.
Riddler