Factory Rear Sway Bar

Hey Guys and Gals,
I am wantin to put my factory A Body rear sway bar in my 74 dart. Cant figure how it goes in.(Told it came off a 76 dart cop car)
The rear has been switched to an 8 3/4. Not sure if this is why I cant mount it or what.
Any help is appreciated and pics of one installed would be even cooler.
Thanks