You should not have ANY bushings on your swingarm. They would last about a day. They are needle bearings which are long, rodlike bearings.
Buy the bearings and make sure you grease them with a good coating of waterproof grease, but be careful not to knock the bearings out of their track Also grease the shaft.
GREASE LINK
Whoever told you that you have bushings there is wrong. NO BUSHINGS!!!