Question about Stumpy's Traction Bars

I sent him an email about the subframe connectors and haven't heard back yet, so I figured I would just ask this here instead.

Do they replace the stock shock mounting plates that attach with the U bolts( my mind is blanking on the correct name) or do they just attach to them? I know that some of the ones for the vintage mustangs did.
And do they fit ok on rear ends other than the stock II 8 inch?

I am thinking about selling the stock 8 inch rear on a Pinto site (they love those things there) and need to know if I need to keep the shock plates or not.

Thanks,
Russ
 
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