I'm 99% sure all 4th thru 6th Gen EXs have rear discs.

The 5th and 6th gen SEs are pretty much LXs with alloys, and a sunroof, so they have rear drums.

I'm not sure, but I think the 4th gen SEs were more closer to EXs than they were to LXs like 5th and 6th, so they had rear discs :dunno: