Which pushrods do you have to replace? Your local hobby shop has .047 pushrod material. Various lengths, threaded on one end, so you can make them up yourself.

You can also call Horizon Hobby. They sell the Alpha 40. You can do a search "RC Airplanes" Hangar 9, Alpha 40.
Click on "Description" and it will take you to a more detailed view of the 40. You will find you can download the
owners manual there. However, it does not show the pushrods, niether does the parts listing.

It's either call Horizon or go to your local hobby shop. You can make them up for yourself.

http://www.horizonhobby.com