CDs are a bear to search and only work on Windows PCs, not Mac or UNIX.
Your SM is out of print, but Ebay has originals and reprints coming up
with comfortable frequency at prices that will ruin your day. I paid
$120 for a 2-volume reprint (with spiral binding!) for a 107 Body &
Chassis, and $111 for a slightly used original 1-volume Body & Chassis
specific to my 1980 450SL. I also have a CD that covers engine,
maintenance, etc. With all that I'm still not sure what the plugs
should be torqued to. :(