I agree with Onree. I don't have an older model to compare it with but the rear glass in my 78 which is the same as a 77 is a good 3 or more inches farther down then the glass on an older model, You don't have the rear glass for that 77 do you. I would be tempted to buy it just in case something happens to mind. So unless there is big piece of metal below your 73 rear glass I don't think they will fit.
Terry
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