What driveshaft are you using? It doesn't look like the one they have pictured at all. The flex disc comes in a couple of different sizes. Wasn't your car originally a 318? Also, that's not a 24v adapter, it's a stock replacement flex disc (78mm) for the e36/e46 non-M cars.
78mm Flex Disc
24v Swap Disc/Adapter
Side by side with your installation
78mm Flex Disc
24v Swap Disc/Adapter
Side by side with your installation
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