Sway bar end links from hell

I'm assuming they looked something like these?



I believe there should be a metal bushing that goes inside the rubber one. Then you would have something to snug the nut and bolt against.

Honestly, I'm not sure. I've never bought any. I did a quick search to get a better idea of what you were describing, and was surprised that, in the first image I found, there were no metal bushings in the lower end of the links.
Honestly, I may even be wrong on this. I can't remember if the links have a metal bushing in them, or if the original bolts have a shoulder that fits snug in the bushing.
I'm thinking that either way would be an acceptable way to mount them though, if the factory bolts are gone and you can't locate a bolt with a shoulder like this:



I would find a bolt that fits the hole in the sway bar, then sleeve it with a bushing that fits snug in the rubber sway bar bushing, and make sure you have a nice wide washer for the bolt head to seat against. Either way then, your nut and bolt are only going to sandwich the rubber bushing to a point and then seat.

There should be a metal sleeve in the bushing the nut and washer butt up against