I have a rear sway bar with inserts and bolts that will bolt right up to any 77-96 GM B-body, chevy, olds, buick , or pontiac, sedan, wagon is supposedly different,( i have heard several people say they are , but gm parts guy says they are same?) but if you have a wagon I can get you the dimensions.
It's pretty thick and is 1 inch in diameter. (It's the bigger of the 2 factory ones) Comes with everything you need to mount it (just drill holes in your controll arms, bolt in and your done!
$75 plus shipping