Jan Donga,
Here is a thread that may help;
http://www.rc-monster.com/forum/showthread.php?t=13625
also these should fit
http://www.hobbycity.com/hobbycity/s...C_-_50C_Lipoly
so should these, but they are out of stock here...
http://www.hobbycity.com/hobbycity/s..._3S_25C_Lipoly
as well as these, but it will be close
http://www.hobbycity.com/hobbycity/s...idProduct=7240
I took some measurements when I was wondering the same thing...
You can't read it very well but the measurement on the right is 10mm
So you can do 30X165X51 or 20X180X51
good luck with the search