The GX-50 does not have the 15-pin comm interface connector that the GX-60 has.
The GX-65 has a both a 15-pin comm interface and a 37-pin navigation interface connector, like the GX-60.
So a GX-65 tray should work. A GX-50 tray may work if it has a punchout for the 15-pin connector... don't know.
--Paul
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