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A few pieces I may be interested in:
the plastic cover just behind the engine bay that covers windshield wiper assembly?
Tail lights?
Also the brake proportioining valve if it is a non-ABS car?
If the part is still good, I am need the drivers side window seal. It is the rubber/fuzzy piece that goes around the inside of the window opening that the glass rolls up into. Shown in yellow on your pic that I marked up. Plz pm with additional info. Thanks much.
For open or limited slip diff, please look for a sticker under the rear upholstery under the hatch. 928s got a 'tank sticker' at some point in production. Your car probably has one. Mine is an '86 and it has the sticker, The sticker should have the option codes that the car left the factory with. The code for limited slip is or may be M220. The sticker is probably quite faded.