The John Deere M138283 is an authentic OEM gear designed for use in a range of John Deere lawn and garden tractors, including models like the 102, 105, 115, 125, 135, 145, 155C, 190C, D100, D105, D110, D120, D125, D130, D140, D150, D155, D160, D170, E100, E110, E120, E130, E140, E150, E160, E170, E180, L100, L105, L107, L108, L110, L111, L118, L120, L130, LA100, LA105, LA110, LA115, LA120, LA125, LA130, LA135, LA140, LA145, LA150, LA155, LA165, LA175, S100, S110, S120, S130, S140, S160, S170, S180, X105, X106, X107, X110, X120, X125, X126, X130R, X135R, X140, X145, X146R, X155R, X165, X166R, and Z225. This gear ensures proper operation and power transmission within the equipment's system.