Doesn't GP (Tower Hobbies) sell them. If were I you I would call GP or Tower and tell them one is defective...they are pretty good at working with their customers.
If you get no responce from them. I may have mine somewhere...I'll look for them today.
If I can find them I'll e-mail you but you should try GP first.
Good Luck!
Shubova
[8D]