Not having the part numbers drives me nuts, but if I have to go to the dealer for parts I take the book with me and show them exactly what I want; it makes things a lot easier. I also like the 'wow' factor that the parts guys give me everytime; none of them have seen the book before!

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'98 E300 DT
'87 190D 2.5 turbo RIP
'92 S500 Sold
'03 3.2TL-S A-Spec

I have one for my 82, the exploded views are sometimes useful. I also have the original window sticker and the little metal "card" (useful because it has the engine number).