If your trunk lock tumbler is in the horizontal position and if it is laid out like the W123, this may work:

PeachPartsWiki: Breaking into 123 trunk w/o breaking anything

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85 300D turbo pristine w 157k when purchased 161K now
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked