I also replace all the spool bearings in my reels. Shimano's are very easy to replace but Daiwa's can be a little more tricky because of the bearing on the spool and popping that pin out can be difficult.
You can get the bearing from Boca Bearings, shipping is free!
You can also get 25% off for the next two months or so by using this code : 25DISCOUNT2012