Here's a pic of the two different kinds of washers. --Scott, thanks for the photo help!

After I put the front end together, I was left with two of the smaller inner diameter washers (and two bolts) and two holes in the top of the grill, but I don't think these two odd-balls go there. I guess I put two of the larger inner diameter washers in the wrong place. But where...?

I don't think I am doing any damange, but I like to put things back together the right way.