Built this today (long overdue, been meaning to do it for over a year).  Thought I'd share.  First of all, I have the T&T bracket and trackbar.

I started out by fitting a piece of 1/4" angle to the side of the existing bracket, and drilling a hole for the existing bolt to help with alignment and tie it in better. I then welded this piece to the bracket.

So that I could easily remove the bracket if necessary, I made up another plate that would bolt to the new bracket.

I then bent up the piece of 1" tubing to fit, and welded both bolt on ends to it.

Then all that was left was to bolt it up (except of course paining it)