Yupp, there are various types of carpets available in market. Its better to have from a mustang shop not the ordinary one. Also some people like to match them with their color of car.
Dear this isn't the big issue. Its might be due to brake switch, that loose its grip and need to replace. Also with the passage of time this type of parts need to replace. Not a matter of worthy, just check your vehicle to service man in regular intervals for maintenance.