Series 21 or 22 pilot jet?

Going to change out my PJ, but not sure if its a series 21 or 22 pj. Its an '04 wr 450. I tried searching the old posts but coulnd't find anything. Also, does anyone know what size in mm the carb is, the manual i have doesn't specify. Thanks for any input given :applause:

39mm Keihin FCR

thanks WGP

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