Stud sizes (Ammeter & Starter Relay)

My buddy has a 1963 Dodge 440 (with a 383). He has asked me to help him with the Mad Electrical ammeter bypass. So, I'd like to get some things prepared prior to the job.

What size are the studs on the factory ammeter? My '71 Dart GT has #10 studs on the ammeter. Would the '63 440 be the same size?

Also, what size is the starter relay's BATTERY stud? Again, same as my '71 Dart GT? I assume the starter relays can/will interchange.

As always any guidance is appreciated.