what size o-ring for megatech hydro's

[renbar]

hi guys need a favor im trying to find the size o-ring for a megatech hydro caliper im not paying for a rebuild kit thats @10-12 euros when i can get just the o-ring which is all i need heres a link to the rebuild kit and i will post a link to the brakes in a min

http://rc-car-online-shop.de/shop/e...000-14-mecatech-expert-piston-spring-set.html

http://rc-car-online-shop.de/shop/en/products/y1129-mecatech-hydraulic-brake-expert-y1129-set.html

cheers ren