So if that's how they attach, then the left hand side should have captive nuts in place on the barwork so you'll be able to use the standard GQ plates but may need longer bolts.
Printable View
All the holes were already there and ARB supplies the mounting plates that slide down inside the chassis rail.
I think you'll find the positioning of the two holes on the LHS is the same as two of the holes on the RHS but there is a third on the RHS that could be drilled on the left but would need a nut in the inside of the chassis and I'll be buggered if I'm pulling the winch and bar off again to do it.
Like so........ Fit TD's plate to the left side rail with the aid of a captive nut plate from patrol apart.
Attachment 34740
Right side
Attachment 34741
As you can see my bar attaches to the inside edges of the chassis rail not through the inside.