These conversions are known as the "coupe nose" W126 sedans/. Azimuthaviation's example is a full on 1984 500SEL Euro version and pictures of it can be found on the pages of this thread, when it was brouight out for some criminal (but FUN ) street racing with 2 other local AMG coupes around Sascramento a while back..
Mercedes Enthusiast magazine this month has a a great cover feature and 5-page article on the W126 Coupes. The article has the title as I have typed in the thread, it is a great article. Also in the mag are great articles on the W124 400E\E420, W116 450SEL, 190E 2.5, W211 E55 AMG and more. . 320 138 40 43 341 454 250 154