Anybody know what size stud is used on the speaker bracket? I know it uses a thread cutting nut but I was thinking of using a locknut, any idea what size I would need?
Not quite sure what the size is, but it's rather small - seems like it was 1/8" or less. What makes one of them unique is its head - it is very thin so it sits down below the defrost vent. They also do not have slotted heads, they have square shoulders under the head that fits into a little "keyhole" slot in a thin clip, so you don't have to use a screwdriver.
