Here's a UK seller Hella AIR CON CONDENSER 8FC351035-751 OE 1238300770 1238300970 | eBay

You may want to contact them if it will fit your 84?

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85 300D turbo pristine w 157k when purchased 167,870 July 2025
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked