[MBZ] aluminum hood and trunk lid?

[kevin kraly]

I remember someone posting something a while back about how some Mercedes' 
have aluminum hoods.  I noticed that my 300SD has both an aluminum hood and 
trunk lid since my trusty magnet doesn't stick to them.  Is this also true 
for other Mercedes models?

Kevin in Hillsboro, OR
1983 300SD 265K miles, Ursula