I have found two excellent sources for W123 original Fabric & for other vintage Mercedes , plus received within days. prices much better then the potential Netherlands & UK sources too
- oldtimer-textiles.de
- sattlershop.com

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80 280TE, 5 speed
83 280TE- 5 spd, 16.5mm rear sway
85 280SL- 15" Bundts