Starter and Alternator question

[teahead]

I know an E12 works. I parted out one and my 2800CS is currently using its alt. I wish I kept the E12 alt single-wire plug though, but as aforementioned, a spade terminal works (w/some persuasion) for the blue wire.

 

[HB Chris]

So from what car does a "drop in" internal regulated alternator come from, e12, e28 or what?

You can buy a new Bosch Alt that fits multiple models, ask for an e9 one with internal regulator.