This cover from ARB will ensure you're never left stranded, plus yeah, it looks pretty cool too.
Computer optimized cross brace design increases the structural rigidity of the whole axle
Additional housing strength helps keep the ring pinion gears meshing on the flat faces of the teeth, greatly increasing ring pinion life and overall maximum load strength
Top quality, high power neodymium magnets are used in both the drain plug and the dipstick to collect metallic wear particles as the vehicle moves
Magnet location in the end of the dipstick allows the oil to be checked for tell-tale signs of internal damage
Prolonged carrier bearing life due to extra support to the bearing alignment
Approach/departure angle optimized by angled exterior surfaces
Unique dipstick/filler cap design allows differential oil level to be adjusted for customized high driveline angles