I've got a set up for sale too!!
Not sure on offset as they are stored with a friend....
I'll give him a call and see if he can take a look for me.
You're thoughts are right on the concave, the higher the ET the smaller the concave.
I'll dig out some pictures of the ones I've got fitted to the E90, I'm thinking the ET35 rears as they have quite a big concave.....
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