SPROCKET Double. 26T x #50 Chain and 38T x #50 Chain. 1.25"ID Bronze Bushing x 2.81" wide at hub. 26T is 5.50"OD and 38T is 8.00" overall OD. Has grease zerk. New OEM AGCO / Gleaner part 71184317. L SERIES (PRIOR S/N 13000) COMBINE; M HILLSIDE COMBINE (PRIOR S/N 15401); M SERIES COMBINE.