Slightly different outer/inner guard profiles so fitting kit and mudflap shape is slightly different. Have seen some that have a bracing piece that is affixed to the rear side of the inner bolts that braces across to the inner guard (like the later commodores used to) - to make the unit more resilient to reversing up gutters etc, but looking at the parts catalogue for the WB it doesn't show a bracketted version that I can see.
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