Here's a way to do it & it worked for agility proc trinket.
Once you get in the data file Ctrl+F and search for "pvp" you should see the imgur I linked below.
Blue = Alliance Item # Red = Horde Item #
After you add them go back in game & press "Reset Original Data".
Going to test if it works for others as well.
TripyoMember Since 08 Nov 2012
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