Description Idler sprocket with non-relube type bearing. 8 teeth, 5/8 inch bore, CA555 chain. John Deere: For 40 series corn heads to serial number 466450. Corn Head: 243, 244, 343, 344, 443, 444, 493, 494, 543, 546, 594, 642, 643, 644, 645, 693, 694, 842, 843, 844, This item is a suitable alternative for the following: 864-SMA102448, G102448, AMAN102448, AH102448, AG25652AF, AAN102448, A176283C91, A-AN102448, P102448, S62-0741, SH202448, SPR408-YZP, TP-AN102448, TPAN102448, A-176283C91, 851-SMA102448, 020-AG25652AF, 176283C91B, 47365065, 620741, 573399, 87034967, 86583947, 176283C91, AN102448