Read the W124 Stereo Removal at <http://www.peachparts.com/do_it_yourself.htm> . The current dash speaker is an odd size, slightly larger than 4 5/8? (119-120 mm). Trying to put in 5.25" (13 cm) would require some serious cutting if possible at all? Why not buy some 3.5" or 4" which will fit? Next time use 'search' first.

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Patrik Sjoblom....1993 MB 320 CE......Bought Jan 2001. Only 16.8 mpg
Stockholm.........Silvermetallic....DEFA immobilizer/alarm + Original larm
SWEDEN............17x7.5 ET35 wheels with 215/45-17 Kumho 712 ECSTA .