I'm pretty sure you can get a pair from Carson but you will have to email them or call them about it.... it shows up in their stock and on their price list but i guess you cant order online... it might be worth a try that way you get what you want.. here are the links to the pages.
heres the contact page:
http://www.carson-modelsport.com/en/legalnotice.htm
and here is the price list:
http://www.carson-modelsport.com/en/news/pricelist.htm
and this is the stock number you just have to paste it into the search: 500907061