Whitz Racing Products Hyperglide B6.2/B6.2D Full Ceramic Bearing Kit

So I bought these ceramic bearings for my B6.2d and during installation I noticed that they don't come with the 2 smaller bearings that go inside the ball diff. Had to use the kit bearings there instead. Is this normal with ceramic bearing kits? They're advertised as having everything except the steering bearings. Are they more specifically sold for kits with a gear diff? Really seems like you would want the ceramic bearings inside the ball diff to help with rolling resistance. Anyway, just a little confused about this.