I'm a little late to the game here, but I have to point out that that pin out is wrong. Not sure where it came from, but, according to my truck, and also according to another pin out I found, the numbers are a relativity mirror image of what this picture says. Notice the molded in numbers 21 and 26 in the picture I took.
That being said, pins 10 and 22 (the correct pins) are the ones needed. Note, 10 is the fog lamp and 22 is the parking light (crap... Now I can't remember if that was right or the opposite...), so make sure to point the diode in the right direction (band on the diode toward the fog lamp). Otherwise the parking lights will come on when you turn on the fig lamps... Not that they aren't already on at that point, but, that's the theory, anyway.
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