This is a Cub Cadet IH-385076-R91 seal. It fits:

Cub Cadet 100 - Cub Cadet Garden Tractor - Transmission Case, Diff & Reduction Housing
Cub Cadet 1000 (2050550U, 2050540U) - Cub Cadet Garden Tractor - Transmission Case, Diff, & Reduction Housing
Cub Cadet 102 - Cub Cadet Garden Tractor - Transmission Case, Diff & Reduction Housing
Cub Cadet 104 - Cub Cadet Garden Tractor - Transmission Case, Diff & Reduction Housing
Cub Cadet 106 (2050037U) - Cub Cadet Garden Tractor - Transmission Case, Diff & Reduction Housing
Cub Cadet 108 (2050043U, 2050209U, 2050210U) - Cub Cadet Garden Tractor - Transmission Case, Diff & Reduction Housing
Cub Cadet 1200 (2050056U, 2050570U, 2050580U) - Cub Cadet Garden Tractor - Transmission Case, Differential & Reduction Housing
Cub Cadet 122 - Cub Cadet Garden Tractor - Transmission Case, Diff & Reduction Housing
Cub Cadet 124 - Cub Cadet Garden Tractor - Transmission Case, Diff & Reduction Housing
Cub Cadet 126 (2050039U) - Cub Cadet Garden Tractor - Transmission Case, Diff & Reduction Housing
Cub Cadet 128 (2050045U, 2050217U, 2050218U) - Cub Cadet Garden Tractor - Transmission Case, Diff & Reduction Housing
Cub Cadet 1604 (142-580-100, 142-582-100, 142-582-399) - Cub Cadet Garden Tractor - Transmission Case Differential & Reduction Housing-582-S
Cub Cadet 1604 (143-580-100, 143-582-100, 143-582-399) - Cub Cadet Garden Tractor - Transmission Case Differential & Reduction Housing-582-S
Cub Cadet 1604 (144-580-100, 144-582-100, 144-582-399) - Cub Cadet Garden Tractor - Transmission Case Differential & Reduction Housing-582-S
Cub Cadet 1604 (145-580-100, 146-580-100) - Cub Cadet Garden Tractor - Transmission Case Differential & Reduction Housing-582-S
Cub Cadet 1606 - Cub Cadet Garden Tractor - Transmission Case Differential & Reduction Housing-582-S
Cub Cadet 1604 (2050598U, 2050599U, 205-0582) - Cub Cadet Garden Tractor - Transmission Case Differential & Reduction Housing-582-S
Cub Cadet 580 - Cub Cadet Lawn & Garden Tractor - Transmission Case Differential & Reduction Housing-582-S
Cub Cadet 582 - Cub Cadet Lawn & Garden Tractor - Transmission Case Differential & Reduction Housing-582-S
Cub Cadet 70 - Cub Cadet Garden Tractor - Transmission Case, Diff & Reduction Housing
Cub Cadet 70 & 100 - Cub Cadet Garden Tractor - Transmission Case, Diff & Reduction Housing
Cub Cadet 71 - Cub Cadet Garden Tractor - Transmission Case, Diff & Reduction Housing
Cub Cadet 72 - Cub Cadet Garden Tractor - Transmission Case, Diff & Reduction Housing
Cub Cadet 73 (2050036U) - Cub Cadet Garden Tractor - Transmission Case, Diff & Reduction Housing
Cub Cadet 800 (2050050U, 2050510U, 2050520U) - Cub Cadet Garden Tractor - Transmission Case, Diff & Reduction Housing
Cub Cadet 86 (2050042U, 2050207U, 2050208U) - Cub Cadet Garden Tractor - Transmission Case, Diff & Reduction Housing