All 3 serial number ranges have the same switch. Take your meter and see if they ohm out like the truth table in the picture. The part number you need is 925-3163.
I have a parts 2185, I will remove the switch tomorrow afternoon after work and check it.
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1572, 1864 x2, 1810 x2, 1863 & GT1554(Dad's Ole Mowers), 1811,782D, 1872 x2, 782DT(Sold), 3235, 1860, 1772 with 3-point and Turbo.
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