Just did that idler pulley setup replacement two weeks ago. New Idler arm is unpainted (old one was painted) so the step washer (PN 738-05082) will need some thinning done where it goes through the idler arm to eliminate some of slop (to condensate for the lack of paint) as the new parts are added. They also changed the washer I thinking to a thick spacer. Also if you look at the attachment point of the engage cable spring on the idler arm you probably will find it nearly worn through too.
PNs 738-05082, 783-08654C, and 750-06184 will need replacing.
Hopefully the brake shoe isn't worn to be as they are very expensive.