The following links and resources may be of interest.
Please let us know of any more that would be worthwhile to add.
New Zealand Army Website
http://www.army.mil.nz
Royal Tank Regiment Association
http://www.royaltankregiment.com/en-GB/aboutrtrassociation.aspx
1st Armoured Regiment Association RAAC
http://paratus.org.au
3rd and 4 Cavalry Regiments Association RAAC
http://www.3-4cav.asn.au/webdb/content/welcome-3rd-and-4th-cavalry-regiments-association-inc
NZMR Association: www.nzmr.org
QAMR Facebook: https://www.facebook.com/QAMR1864
Mounted Trooper Association https://www.facebook.com/search/top/?q=the%20mounted%20trooper%20-%20royal%20new%20zealand%20armoured%20corps