Husqvarna PZ29D PZ6029D PZ29DCE 90 Degree 1:1 Gear Box 575509401. Input and output shafts are 1 Diameter. Used on the following models. Husqvarna PZ 29 D (966554801) – Husqvarna Zero-Turn Mower (2010-03) – Engine. Husqvarna PZ 6029 D (966476701) – Husqvarna Zero-Turn Mower (2010-03) – Engine. Husqvarna PZ 29 DCE (966616701) – Husqvarna Zero-Turn Mower (2011-02) – ENGINE PLATE.