Upper control arm shaft

[Sik5chevy]

I pulled off the upper control arm shafts on my 65 c10, because they felt loose and the mounting holes seemed larger than the studs coming through the frame. I figured they were worn out just like everything else on my old pickup. So i ordered new ones and they are the exact same size and bolt up just as loose and the nuts they sent with the new one thread on perfectly. I figure maybe i am missing something - i have a round disc and 3 horseshoe shaped shims and the control arm shaft. Is there something else that goes in there to tighten everything up?

Thanks in advance for your help.