In what recepticle do I put the power steering fluid in the engine compartment of a 2002 ML320? I see all sorts of caps to unscrew, but I'm not sure which is which. I can recognize the washer fluid, oil, power brake, and radiator caps, but I can't find the power steering fluid cap.

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2002 ML320 (thereby making my 560SEL my "spare).
1992 500E, pearl black, 27,000 original miles as of 7/2003.
1990 560 SEL, black pearl metallic, sweetness to drive. Fully outfitted with driving countermeasures (Beltronics radar/laser detector and Uniden BCT-12 Bear Tracker scanner).
1985 Porsche 911 meteor metalic gray, a rocket to drive.
1988 Chevy Silverado pick-up (gotta have something to drive to the rodeo!)
1978 Corvette Indy pace car for show
1971 Opel GT for sentimental reasons