with kalt no longer with us, its going to be hard to find parts.
might try ebay or various RC classifieds for used helis or parts.

googled this up so it might be good to call and ask if they can help. http://mtahobbies.com/kalt_helicopters.htm
or
http://www.modelhelicopters.co.uk/ac...alt_spares.htm

hope that helps.