Welcome to Only Cub Cadets Tom.
I tried looking on eBay and it lists both blade types for your mower. You can take your model number and serial number and look it up on Cub Cadets part site.
I probably would just take one off and see, just to remove all doubt.
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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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