2A wheel stud thread size

Hi everyone
                    Does anyone know what Thread will be on my 1963-2A
wheel 
studs.
 Also does anyone know if it is possible to get locking wheel nuts the
same 
size.
My thinking is that if i can't get any, i might be able to tap out some
that 
have a slightly smaller thread

Thanks

1963 2A petrol
1991 Toy Landcruiser