Ball bearings carriers are MUCH more common than those that use tapered bearings. Ball bearing carriers use the same bearings as the stock carrier and if you look inside the carrier, there should be a loose tube that goes between the bearings. The tapered bearing carriers do not use the tube. Tapered bearings can easily be over tightened and require a "wave washer" to maintain the tightness. Ball bearings can and should be tightened down very hard and then the second nut should be tightened against the first nut until your veins bulge out of your neck.
Tell us where you got the carrier and/or show us a pic and maybe we can help you more.