I had the same issues with the addco Front sway bar. I ended up talking to Dick at Firm-Feel. His sway bar fits and his mounting brackets for the k member are a lot nicer.
Its all about the mounts on the early A's than the bar. I tried the Addco bar and after 3 or 4 hours of trying to make the mounts work, I talked to the people at FirmFeel and bought theirs. It is a much better designed mount...