Arnaud,
Check this site:
www.rcrockcrawling.com they have both aluminum and steel in metric as well as SAE. I've used them on my AirWorld F-5 & SkyGate Hawk.
Select the title "Rod Ends" under their Products Listings for 21 different sizes/types.
http://www.rcrockcrawling.com/produc...0dfe2046d4d87a
David S