Firstly, please don't take this as gospel. I work for a bike charity. We get a lot of Carreras in for refurbishment, service or repair and when we have a hanger issue the boss always says "Go find a Carrera and take the hanger off that". We go through the mountain of bikes, find a Carrera and remove the hanger and 'usually' the hanger is exactly what we're looking for. I know only too well how many hanger types there are but we've rarely struggled with Carrera.