Wiper arm question.
Reply #10 –
Ok, the Mustang wiper arms will not work on an '87-'88 Tbird/Cougar, unsure of the older years. The angle of the arm itself, as well as the Tbird/Cougar having the wipers park under the edge of the hood mean that the Mustang wipers can be on a solid arm, but the Tbird driver's side has to have a second arm that will cause it to stay aligned at the end or top of the sweep.
Also the Mustang arm has an angle in it out toward the wiper blade to help with this, and if you'll notice, the shaft is also further outboard of the glass than it is on the Thunderbird and Cougars.
Check my pic out for side by side shots. I'm sure that if the Mustang arm would fit the shaft that the wiper would probably be at an unusable angle when parked, probably enough to cause an issue. Add in a longer wiper, and that problem will "grow" in relation..
EDIT: Thunderbird arm on the bottom (in case it's not obvious
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