I have two OEM 15mm rear Swaybars available for sale. Purchased many years ago from MB.
1) Used ~10 years until recent swap to larger dia. Bar, Looks close to new other then wear Support Bushings contact- $300.00 with shipping within USA.
2) Never used or mounted, looks new- $350.00 with shipping within USA.

Buyers send PM to arrange purchase

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83 280TE- 5 spd, 16.5mm rear sway
85 280SL- 15" Bundts, 5 spd