Everything I've seen uses a #25 chain.
6mm is different pitch than #25 and 25 heavy duty chains..if those links below cant help ya out then get the longest link chain and a few masterlinks and make the right chains for all...Almost all my 6 cags had different length chains........well i dont know what #25 h is sorry as far as i know it takes 6mm chain and i can only get chines ones tell what i should look for and ill get it