The original lash adjuster is on the right. The left and center adjusters are packaged as 5L1Z-6500-A. Just from looking at them. the one on the left is the same as OEM but is the center one an updated version?

 

Just an FYI, Apparently Ford parts is packaging the 2005-2010 Mustang GT lash adjusters as 2004-2008 5.4 3 valve adjusters using the same part number. Thanks for no response Ford parts.