Many of the 'luxury' items, such as leather trim, were replaced with more durable and cheaper materials, and over the course of the following years the range of available paint and interior colours was dramatically reduced. Various unique Minor trim items and components (such as light units and heaters) were also gradually replaced with ubiquitous items from the BMC range. This programme of changes succeeded in giving access to improved economies of scale to allow production to be ramped up. By the turn of the 1960s, over 100,000 Minors were being produced per year, compared to fewer than 50,000 per year a decade earlier.