The Sun 501-5993-06 is available from Calhoun Technologies. Calhoun Tech can help your company save up to 80% on IT Hardware. Manufacturer: Sun Part Number: 501-5993-06 Details: Sun 501-5993-06 6 Slot Disk Backplane . 286D2-Bap25-2C/281-3C 287-1C Cl3*5