Here is a list of people who are known to have "The Knowledge" on many things to do with Land Rovers - in NZ.

The list is not, by any means, a recommendation or approval that they will or can do a great job or not cost much... Caveat emptor!
In no particular order:

• Auckland Speedometer Services
  Speedos, rev counters, speedo cables
  09-443-2060 - Steve - Glenfield, Auckland
   
• Mainlandrover 4x4
• Suspension, guards, wheels, winches, Diff upgrades
• Phone 09 576-1304 or Ashley on 0274 956 999
• East Tamaki, Auckland
•  
• Land Rover Spares
  Rex: 0800 577 727
  5 Norrie Rd, Drury

• Classic 4x4 Parts - Land Rover Parts Ltd
  09-828-1433 - Bill or Colin - Avondale - Auckland
  Encylopaedic knowledge for Series & Defenders!

• Stag 4x4
  09-827-4233 - Morris Turner - New Lynn - Auckland
  Servicing, repairs & parts (new and second-hand) for RR Classic & 'new', Discos 1, 2, 3 & 4, Defender (and Series, sometimes), Freelander (P38 air stuff - especially)
•  
• Top of Range
  09-415-8148 - Brian & Brett  - Albany/North Harbour - Auckland
  Servicing, repairs & parts for RR, Disco, Defender, Freelander
•  
• Bramble Downs 4x4
  09-810-9894 - Tim Warburton - Kumeu - Auckland
  Parts, servicing, mechanical repairs - all LR types from SI thru to latest models and 101s!
  Encylopaedic (or should that be Wikipaedic?)  LR knowledge!
•  
• Mamaku 4WD
  07-3325630 - Mamaku/Rotorua
  Parts, servicing, mechanical repairs for Series/Defenders/Discos/RRCs
  Legendary service!
•  
• Central 4WD - Queenstown
  Parts, servicing, mechanical repairs
  Very helpful with 'foreigners' from Northern parts looking for Series wheelbearings