I use a piece of rectangular tube to make the new track bar mount for the frame side.
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I butt it up to the back of the outboard mount. You don't have to leave it long like I did above. The tube is 2 x 3 x .188 wall which is the perfect inside width for the Currie ends. The top is coped to fit up around the little tab at the forward edge of the gas tank crossmember. That edge and the forward face of the mount line up to put the trackbar right back where it used to be - about 3/4" of length.
I slice off one 2" side to give me the U shape, cope the end to fit around the angled tab and then touch the crossmember on the sloped edge of the little valley. Once I have that done and fitting so the mount is vertical, then I use the joint to lay out the hole so there is some space at the back of the U for the body and just a small amount above the body. Those two dimensions determine the hole location. We cut about 3/4" off the threaded tube to shorten the bar.