Specifically, I'm seeking out legamorph (rabbit) ears that are up, bent halfway, and/or lop. The ones by Helen-sims are unappealingly short (they look more like a Patagonian Mara's ears, than a rabbit, to me).

I'm having a similar problem with the rabbit ears. I don't need a tail, as I have one I can make do with, but if you have a good-looking long/thin one as opposed to short and bushy, I'll happily accept it. So if anyone knows cat ears that are like these but for Sims 3, I will love you forever. only to realize they were for Sims 4, not Sims 3. I found a WONDERFUL pair made by NotEgain.

I saw the ones on Simscave, and they're horrendously small, and the ones that were supposedly on RoseSims are apparently no longer in existance (I keep getting an error). I've been searching around for these ears for the last 2 hours or so, and nothing has suited my needs.