Lockyer Farm Machinery is selling this:

Hustler Super Z Diesel 72

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With the high-torque power to get the job done, Z Diesel is for commercial operators who want the convenience of a diesel-powered mower with the same class leading features of its petrol-powered cousin.
ROPS - Folding, supplied with unit
Flex Forks Suspension as standard
2" Cut side discharge VX4 deck technology
Fabricated one piece chassis
Shibaura 25 hp diesel engine
Remote air cleaner
54.5 L (14.4 US gal) fuel capacity
Commercial separate piston pumps and drive motors
24" Drive and 13" caster tyres
Clean, compact design. Much more compact than competitive units
Engine mounted sideways for serviceability and compactness
Patented belt drive system provides up to 3 times longer belt life
Wide stance, low centre of gravity
Simplest maintenance in the industry - no daily lube points
0-19.3 kph (12 mph) top speed - get the job done fast
Dual Hydrostatic - industrial grade pumps and motors
Fan forced hydro oil cooler
SmoothTrak steering - responsive precise control
Very high blade tip speed for beautiful cut - 18,890 fpm
Commercial duty, sealed deck spindles