I noticed that too, about the rivet. If you dont want to drill into your crossmember, you could always spot weld it in place, besides, it really shouldn't be able to go anywhere once its bolted on. I wouldn't mount your a-arms without those brackets though. Did the brackets come with the cross member? Maybe the brackets are off.
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'87 2wd c10
Daily driver
My project in progress...
(when money and time allow)
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