To look up a SKU number for a product, first make sure it is the SKU and not the product number you are looking up. Then go to Carsonind.com download the cross reference download and look up the SKU. You can find more information here: http://www.carsonind.com/sku_lookup.asp
A sku is a stockeeping unit located on a product , a sku is not a model number from a manufacturer but it can sometimes be part of the sku. To find out more go to layer3.wordpress.com/2009/05/.../symantec-sku-lookup-tool/ -.