I recently installed a Grohe Dal Adagio concealed cistern 37762. My wife wants to get a square/rectangular air button flush, however looking at Grohe's website the only buttons are circular and she feels a bit boring. She likes some from Geberit (Rumba, Tango and Mambo) and Grohe (Chiara, Tenso, Atrio, Skate and Surf). Can any of these be used with the cistern I have installed? Are there any other more interesting air buttons that we can use?