LD is my favorite brand of remanufactured or refilled because i always get a cartridge that works!   --->>>
 (these will work in you hp designjet 430 or 450c)

HP #40 (Black)​ ink cartridge​f rom amazon --->>>
(will fit your 450c or 430 HP designjet)

<<<--- more #40 HP ink ​from amazon
(WILL FIT YOUR 450C OR 430 hp designjet)