Just took possession of a Devon Aztec yesterday. It has a whale shower (it is the bathroom sink and then you pull it out to become the shower) The head needs replacement. Are all shower heads a standard size??? 1/2 inch? Do I have to replace with another Whale head or can I get one with a trigger which seems a good idea. Also tips on shower curtains. We seem to have a rail with tiny curtain hooks - do you buy special shower curtains?