Console Top Plate Fasteners

There are 2 different types of those nuts. Some are made for machine threads. Best/or first to come to mind in a-body example are on the back of gauges. Those are for #10-32 NF and will not cut threads.
I don't know that the other type that will cut threads in a soft tapered post may be listed in similar numeric sizes but I do know where there is a more common use of them... Vintage toys. In fact, there is a member here who has connections to toy restorers because he does some of it. I'm sorry I can't recall his user name. I'm just thinking such a company might sell and ship X number of one size and the others where a hardware vendor would likely stock boxes of 25 or 50 count. Google vintage toy restoration?
Good luck