I just noticed when you go to the main page on RealOEM.com the E30 catalog is gone. They updated last month and moved the E30 catalog over to their 'archive' section. Just use the drop menu on the left to select Archive (as opposed to Current) and you can find the E30 stuff there. E36 people are still current.
I think you also need to select the archive when searching for an E30 part number.
Sorry if this is old news, its new to me and thought I'd give the heads up.