Been a long time since I did one in a 63 GP.As I remember there is a stud and the other hole is for a bolt.I just moved the adapter around untill I got a good match on the dash,marked around it and drilled the wire hole with a 5/8 hole saw.It went thru very easy.Then drilled the holes.I do remember it was a PITA to get the bolt in to mount it.Maybe someone will have a more recent install.Tom
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