Yeah, I agree with Kalex on this one..... Those c-bushings don't look like any I've installed or seen. It looks like the outside edges/rim are tucked under or cut/ripped off. I'm no expert but there's a lot of more knowledgeable guys and gals on here that I'm sure will chime in.
I went ahead and posted your c-bushing pics.
I went ahead and posted your c-bushing pics.