My Dinan bars use the stock rear links (which would be nearly impossible to wear out by design) - with a bolt through the bottom where the stock bar ends stuck through.
I don't see the point of using such a complex heim-joint link to connect the rear sway bar. By eliminating the small amount of rubber in the stock joint you gain a tiny bit of stiffness, sure - but..
Heim joints are for track cars. They're strong and they're precise, but they're open to the elements and aren't long lived if they aren't taken care of.
Is there not a way to bolt to the original end links with the RD bar?