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Anyone know where to get and what size the screws are for the DC-30 collars?
For the battery and the GPS.

After calling Garmin and finding out that they didn't know what I was talking about, I went to my local Ace Hardware store( a big 0ne).
The stainless steel screws for the GPS antenna plate are: M3x10
The stainless steel screws for the battery plate are: M4x10