I'm assuming you're VERY new. Nismo is Nissan Motorsports Japan, so yes they make LOTS of parts. Arms, bushings, coilovers, struts/shocks, swaybars, strut tower bars, etc.
http://www.nismo.co.jp is their site, and any Nissan dealer can order parts through Nissan Motorsports US, I have a 2002 Nismo Japan catlog I got from my dealer, you can buy or order one too.