Thanks for the offer The Twin, but for now -right now- I'm going to concentrate on getting the engine running. I might get back to you soon.
Did a little poking this evening with the aid of the book I just got: "BMW E30-3 Series Restoration Bible." Great book, but the picture on the front is of a pristine red 2-door with bottle caps, just like (and not like) the heap of rust in the shape of a 325iS I have in the driveway.
Maxbell: You're right, the back is for back seat type people. It's for people you have to carry but would rather not, and it's handy for them to have their own door so that the front seat Important People don't have to get out.