The Ones I have on my 450:
http://www.banggood.com/Wholesale-Su...r-p-60600.html
The ones I have on order:
http://www.banggood.com/Wholesale-Su...r-p-59929.html
I've bought an extra 980kv motor too - so I have six in total, just in case I end up going Hex in the future.
The 2216 with short shaft was out of stock when I ordered - but it's no problem as the shaft just goes through the hole in the frame anyway.
I'm thinking about putting the six on one of these:
http://www.rctimer.com/product_809.html
Or buying the RCT800 frame and using the arms on my 450 to make it bigger / more stable.