Well, I got the belt and put it on. It did change the location of the idler pulley in relation to the drum. I also replaced both rollers, the idler pulley, the front felt bearing and the rear felt seal.
Now it goes kabump kabump....kabump kabump...kabump kabump, as the drum turns. I looked under there while it was running and notices that the idler pulley is falling into the scallops in the drum as they pass by each revoluton and then bumping the other side of the scallop each time which causes the noise.
That makes me think that something is still wrong because it causes more noise than I would expect form a dryer. It can be heard from he next room.