Silly thread.
I agree with Shaniqua.
Look, MB Doc was being polite. This idea is just plain stupid for two reasons - Fords are American and MBs are German. Except for some ABS components, they are unlikely to have any parts in common.
Secondly, even if you found a cap that looked like it would fit, would you risk damaging your ignition coils, your rotor, etc. just to find out if there's $50 to be saved? It's gambling hundreds of dollars for a
potential savings of tens of dollars. It's the same reason you'd never race a Ford Pinto for your pink slip. Sure, you'd probably win, but what have you actually won compared to what you could lose?
Cheap out on your washer fluid if you must, but buy a real cap and rotor!