HP 0231A81E - Spare 7510 fan tray assembly - Includes six 92mm x 92mm (3.62in x 3.62in) fans and four 120mm x 120mm (4.72in x 4.72in) fans - Produces maximum air flow of 662CFM Retail
HP JC634-61001 - 10508-V spare fan tray assembly - Includes twelve 120mm x 120mm (4.72inch x 4.72inch) fans in a slide-out tray assembly - Produces maximum air flow of 1152CFM Retail
HP JC633-61001 - 10508 spare fan tray assembly - Includes eight 120mm x 120mm (4.72inch x 4.72inch) fans in a slide-out tray assembly - Produces maximum air flow of 1440CFM Retail