You have to take the center console wood off after which you can unscrew the center console (plastic) cover complete with armrest (Phillips screws inside the storage compartment box). Once you have taken off the complete center console, you can get to the screws that hold the casette holder and cover...

I have a set of euro headlights for the W129 SL in case you are interested (out of my own SL after I went for Xenons).

greetingz,

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1990 300SL-24
1993 C250D with a minor 600+k kilometer
www.MBenzNL.com(the Netherlands)