Do I have the wrong wiper arm/blade set-up ?

IIRC, There should be a 15 or 16 stamped into the bar there somewhere. Maybe a letter along with it. The 2dr HT's and convertibles had a slightly shorter arm than the sedans due to the shorter windshield. The glass angle was slightly different too. It's also possible that your arms are off another model altogether. If someone has a 2dr HT about that year, they may be able to measure theirs to compare it with yours.