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If you sand them (320/400 grit) and they get brighter, they are aluminum. I you sand them and they appear darker they are magnesium. Mind you if they are badly oxidized this could be difficult to determine...They are likely aluminum, I say that due to the appearance of galvanic corrosion on the outside of them, unless the white powdery residue is from something else. Try the inside of the covers with this test.
The new F 150's rad support and Chev PU dash supports are Magnesium as well...light weight.
Magnesium turns dark as it oxidizes and that one looks pretty dark to me. I'll agree if it feels like it's too light for it's size (or gives you the effect that it's made of plastic) then it just might be mag.
Just a note on the "too light for it's size",I held a magnesium K-frame once.You would have thought it was for a full size plastic model,virtually weightless!
RT