Premium quality replacement part, round rollers compatible with Snapper models: RD 18S40 – LT300 Series 40″, 18 hp RD 18VG40 – LT300 Series 40″, 18 hp RD 2040 – LT300 Series 40″, 20 hp RD 1840 – 40″, 18 hp RD 1740 – 40″, 17 hp LT 1840 – 40″, 18 hp LT 18400 – 40″, 18 hp LT 2040 – 40″, 20 hp LT 2040 – 40″, 20 hp YT 2040 – 40″, 20 hp YT 1840 – 40″, 18 hp LT 1644 – 44″, 16 hp ZT 18440 KH – 44″, 18 hp YT 1844 – 44″, 18 hp ZT 20500 BV – 50″, 20 hp EZT 20500 BV – 50″, 20 hp 375Z (EZT 2050) – 50″, 20 hp 1606 – 40″, 16 hp Kohler 1616 – 40″, 16 hp 1616 H – 40″, 16 hp 1693968 – 40″, 16 HP Compatible with Simplicity models: 1606 – 40″, 16 HP Kohler 1616 – 44″, 16 HP 1616 – 40″, 16 HP 1616 H – 40″, 16 HP 1620 HP – 44″, 20 HP Includes: 2 x Round Casters: 1722036SM, 1722036 Length: 104 mm – 4.1″ Inner Diameter: 17.1 mm – 0.67″ Outer Diameter: 63.4 mm – 2.49″