Date registered: May 2007
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FS: 300SDL Undershields (Sound Panels) (antinoise capsules)
From an 1986 300SDL: Two anti-noise panels, also known as sound panels,
undershields, or antinoise capsules. Should also fit 1987 300SDL, and 1986 and 1987 300SD
Part number A 126 520 00 23 (superseded by A 126 520 09 23)
Price new: $280
Part number A 126 520 07 23
Price new: $368
My price: $100 for the two panels + actual shipping cost by FEDEX or Greyhound
The larger panel has had a number of small cracks repaired using 3M DURAMIX Semi-Rigid Plastic Parts Repair (urethane based, 2 component).
The repairs were reinforced with glass fiber cloth. The repairs have not been
sanded down and look a bit crude, but the repairs are probably stronger than the panel. Since the panels are only visible from under the car, I never bothered making them look nice. The smaller panel has no cracks.
Since I sold my SDL (and forgot to reinstall the panels prior to the vehicle sale) , these are just taking up storage space.