Don't hold me to this -- I could be wrong.
I think they are making a new, optional, oversized ball stud, ball cup, and turnbuckle. If I'm right, then that may be what you've got.
If you're concerned more about durability than weight, I reccommend getting the larger ends and studs. If you're an experienced racer, you might want to get the standard turnbuckles.
For the standard turnbuckles, Losi makes an upgraded ball cup. Check your friendly local hobby store.