Part Number: AUC18708, AUC15805, AUC13979, UC10104, TCA26088, TCA24615
AUC18708 Compatible with John Deere Turf System Mower Models: 1550 (60/62/72 inch deck), 1570 (60/62/72 inch deck), 1575 (60/62/72 inch deck), 1580 (60/62/72 inch deck), 1585 (60/62/72 inch deck), 6700A, 7200A, 7400A, 7500A, 7700A, 8000A, 8700A, 8800A, 8900A, 9009A.
TCA26088 Compatible with John Deere Walk-Behind (Commercial) Mower Models: W36M W36R W48M W48R W52R W61R; Compatible with John Deere Quik-Trak Mower Models: 636M 648M 648R 652B 652E 652M 652R 661R.
AUC15805 Ignition Switch Compatible with John Deere ZTrak Mower Models: Z720E Z730M Z735E Z735M Z740R Z915B Z915E Z920M Z925M Z930M Z930R Z950M Z950R Z955M Z955R Z960M Z960R Z970R Z994R; Compatible with John Deere Greensmower Models: 2400 2500B 2500E 2550 2700 2750; Compatible with John Deere Utility Vehicle Models: XUV550 S4.
This is a replacement part, not an original, but it works perfectly and is a reliable option for you.