Need help, noise in back

[zzmac]

I finally was able to pull the back wheel off today and get under the car for a visual inspection.

Re - Axle Nut I don't have the proper tools to check for tightness but I don't have the old style nut. It has what looks like a single Flanged Crimp Nut that was the first replacement for the old style ones. (I'll have to order new ones as a Superformance service bulletin that Blas was nice enough to send me says to use double nuts.)

When I was under the car I found what may be a / the problem (not sure if it would cause the thud, thud noise I was hearing though).

I've attached some pics of the rear suspension and the first 3 pics show the potential problem and the last pic is the same part on the other side which is how it should look. I can't tell if there should be a washer there or what but it's rubbing the paint off the frame (and hopefully not making the hole bigger!).

Can someone with more knowledge than me about these things tell me what the problem there looks like and if there is one would it be easy or hard to fix?

(having problems uploading pics.......)