Originally Posted by Satilite73

I have one on my wagon, I pulled it off a late '80's M-body cop car I parted out, I don't think its cop car specific though.

Old blurry pic on my wagon......

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Photo pulled from web showing it on an '88 M-body (circled)

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On those it was cop and taxi specific. Normal M bodies had a regular oil cap right on the valve cover.

I'd have thought a van one would be easier to find but but be too long if it's extending all the way to the hood.