As promised, here is a link to get those hub convertors for Callum's Maverick. I thought I'd got them from RC Mart but it was another company, Tamiya Store in Hong Kong. I paid with PayPal so at least you don't have to worry handing over credit card details
Took a couple of weeks to arrive safely...
http://www.tamiya-store.com/shop/ass...-90010764.html