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Be VERY careful. In 2004, there was a change to the glow plug:
Due to the design change of the piston, the glow plug has been made shorter by 1.2 mm. If the longer glow plugs are installed into an engine with updated pistons, glow plug to piston contact will result, ending in potential catostrophic engine failure.
I do not know EXACTLY when this change was made OR what manufacture date began the shorter glow plug. Maybe a tech will know, but I would take the VIN to a dealership and get the price quote AND part number.
The spreadsheet I sent you has some troubleshooting tips for determining you have glow plug issues.
The design change on the glow plug length took place in 2004 to accommodate the updated piston bowl design. The 2004 and later 6.0 glow plugs are 1.2 mm shorter then the 2003 6.0