These tips yes?
They're working very well for me also. It seems necessary for me to make the ends of the tips sit flush with the ends of the barrel. For some reason it allows me to push for a deeper fit. If the tips are slightly longer I can't get them to comfortably sit past the second bend of the ear canal.
Apuresound makes cables for the ER4S (I think they still do) here. I'd actually love to get one but I'm not spending $180. I also wish the cable was lighter, but I use a shirt clip for the gym which completely takes care of the issue. The cable does feel strong enough to take some abuse, which is nice.