Hi, in NZ on trademe there is a seller in Dunedin, bj_autos1 who stocks most parts - just look for one of their auctions then ask a question about the parts you are after. Also in Akl there is landroverparts.co.nz, they have an online catalogue, and claim to have any spare you need (they don't list the boring stuff on the website). Also, it can be worth looking on Ebay in Aussie, there is a big trader on there selling lots of stuff, postage would be a bit cheaper than getting stuff sent from the UK. Good luck with the search!
if you are in the north island then these guys are best (landroverparts)
just give them a ring and ask for what you need. they usually deliver the stuff by the next morning. and their prices are better than BJ Autos sometimes