Remington shotgun parts

I have a Remington 11-87 shotgun, and some parts need replacing. I have downloaded a schematic from Remington, but I don't see where I can import them from. Because some of the parts are not minor (the slider assembly etc), soucing them locally will be expensive. Anyone brought Remington parts in before, and where did you get them from?

numrich will ship parts as long as under 100 us
Firearm Parts & Accessories | Military Surplus | Numrich Gun Parts

Have a look at Brownells website, they will ship to NZ. I just imported parts for a Rem1100, no dramas what so ever. Just keep it under $100:00USD :-)

Thanks guys