DESCRIPTION Overseeder Blade Set Replaces Bluebird 5970. 20 Blades per set. FITS MODELS BLUEBIRD P18, P18, S22, S22HUSQVARNA DT22, DT22TURFCO LS20, LS20, LS22 REPLACES OEM BILLY GOAT 350147BLUEBIRD 5970. 3 Pack Blade Set Overseeder Fits Bluebird. Overseeder Blade Set Replaces Bluebird 5970. P18, P18, S22, S22. This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.