Cartridge Summary Reference Sheet Units shipped in March 2006 and after. ® MultiChoice 13/14 Longer Lower Housing Grey Units shipped before March 2006. Replacement cartridges shipped in July 2006 and after. Old Monitor 1300/1400 New Monitor® 1300/1400 Shorter Lower Housing Shorter Lower Housing White White ® Blue or Off White Off White Order RP46074 to Replace Cartridge. 17 Order RP19804 to Replace Cartridge. Blue Order RP19804 to Replace Cartridge.