Finally done with the problem!
I successfully replaced the bearing bracket and guide pulley on same bracket today took me an hour and 20 min to do it. Noticed that however I loosen the 13mm belt tensioner it didn't give the slack that I need to fit the belt but by tagging and pulling from the the top I was able to get it done. My old bearing brackets was really in bad shape that the bearings was already out when I pulled that bracket out. Boy does that 300E hums right now! Thanks for all your help.