i just put in a 120y (jap spec) bar in my 82 ute, 20mm dia by my vernier calipers, the bar is about 30mm wider in total, but the D bushes line up perect. you will need to use the 120y bushes and you can keep the 1200 metal caps. the olny problem i found is the middle of the bar come very close to the sump and needed a masage with a ball peen hammer to give it clearence, when the suspention cycles up, the front of the bar will come down and hit the bottom front corner of the sump.