I rotated the tires today and checked on the arms. I didn't remove them bc I was feeling lazy. After a few weeks, the washers are still keeping the bushings sit very snug. No more clunking noise!
Good news. I rotated my tires today but still haven't bought the correct size washers. The Home Depot near my house doesn't sell the correct size. I'm beginning to hear some slight clunking noise though.