OCC speaker polarity

Just installed new radio in 1991 Custom Cruiser. Metra adapter was useless so I had to wire directly to new radio harness. Shop manual schematic does not indicate speaker polarity. I received information from Crutchfield and want to pass it on if anyone needs it.

Right front: Light green negative, dark green positive.
Left front: Grey negative, tan positive.
Right rear: Dark blue negative, light blue positive.
Left rear: Yellow negative, brown positive.