Years ago MP carried a 1" diameter rear bar for our rides, see part# P4876531. Not sure who was actually making that bar, but it certianly does look like the Addco bar, which is claimed to be an OEM replacement.
I picked up that MP bar from a fellow forum member last summer and installed it in my coupe over the winter. Haven't road tested it yet, but it did replace the factory 3/4" bar, so I'm expecting the back end to be a little less squirmly.
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One more thing: the end-links in our rides need some serious beefing up, LOL...I say this becuase having mounted the bar in the car I asked my wife and daughter to put the back end of the coupe through a serious amount of jounce test...so literally both of them pushing down on the bumper in a steady ON & OFF pattern...I really wanted to make sure there were no squeaks in the bar bushings and that the bigger bar caused no binding against the larger exhaust pipes.
Well, all was good, there was some noise from a completely different component, but OMG, laying under the car and eyeballing the moving parts I was amazed to see the end links visibly bow as the suspension was being compressed.
OK, you might say: maybe it's all stiff being new, etc., etc....sure, but the poly bushings were well lubed with their grease (stick stuff that it is, but awesome), and really the compressed suspension should have caused the bar to rotate. Well, the bar did rotate, but the links were bowing far too much.
Sooo...for what it's worth, I am now looking at sourcing a larger diameter setup, perhaps the Addco end-links might do - although I haven't been able to find any sizing info - as they have a pretty wide ranging size selection.
