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1 1/4" x 1 1/16" - Standard With Models 1000, 3000, 3850, 4000, 4100, 7000, 7700
5/16" x 3/8" - Standard With Models 1000, 3000, 3850, 4000, 4100, 7000, 7700
For 1 7/8" & 2 1/2" - Arbor Nuts