I need to order some tomorrow and I'm going to go down the 26 route also,if you do buy the 21 fittings make sure they actually say Rectus 21 and made in Germany on them. I have bought them from all the top suppliers and in some cases they have sold fakes or dodgy Chinese imports which last no time at all ,even if both are changed at the same time with protecta balls fitted on both ends of the pole they still fail.