I ordered Black TRD FJ Cruiser Center Cap and it will work on a 17" Tacoma Factory Wheel.
Here is the Part Number, only cost $11 each
I would recommend using the thin (emblem type) double side sticky tape from NAPA on the tabs just to ensure they are not going to come off. They did snap on to the wheel, but I added the tape to make sure they didn't come off.
This is a 5 minute job