Hey,
I just found this out the other day. I have a Nitroplanes FMS 64mm F16 with the tiger paint scheme and if you go to Nitros web site it's out of stock and there is no link for ordering spare parts. So out of desparation I called and actually spoke to a real person (I know what a shock). Anyway this person said you have to use the search option on the site and type in (in my case) "64mm tiger spare parts" or something close to the description with spareparts in the searchand it will bring up everything you need. Sure enough when I tried it I was able to find exactly what I'd been looking for. Prior to this I did every possible search (yahoo/google)as well as a complete look over ofNitros web site and could never find my spare parts.
Hope this helps and good luck.
-Jesse