636919-001 - HP Heatsink Assembly for Promo 4000p SFF Systems 636919-001 - HP Heatsink Assembly for Promo 4000p SFF Systems $76.66
636921-001 - HP Fan Duct for Promo 4000p SFF E5800 250/2GB 26 Pc 636921-001 - HP Fan Duct for Promo 4000p SFF E5800 250/2GB 26 Pc $49.06
580230-001 - HP 12V DC SFF Chassis Fan Assembly for 6000 Pro Desktop 580230-001 - HP 12V DC SFF Chassis Fan Assembly for 6000 Pro Desktop $85.18