Can anyone provide me pics of rear disk brake setup?

[teahead]

I'm about to go look at some old E24 rear brakes that supposedly will work on an E9, but want to make sure it's the old style.

Can't find any real good pics on the net.

Thanks!

 

[steely dan]

Here are a couple of photos of the rear disc/caliper set up my early e12 based chassis E24 during restoration.
Only the early 635 had vented discs with twin piston calipers. The later E28 based E24's had narrower solid discs with single piston sliding calipers.
You should be able to zoom in to get the detail you need.
HTH's
Don