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The below I copied from another forum. I just happen to agree with it and it was easier to copy than rewrite it.
The Auxiliary Hardtop for 1963-1964 models had three distinct designs.
Design One: At the startup of 1963 production the auxiliary hardtop had a notch cut in the bottom, each side, to give greater clearance above the door. This design was present until approximately March 1963.
Design Two: For cars built in approximately April, May and June 1963 the notch in the auxiliary hardtop is not present.
Design three: For cars built approximately near the end of June 1963 until the end of 1963 production and all 1964 production the notch in the auxiliary hardtop is not present and rear window reinforcing brackets are present at the upper center and lower center of the rear Plexiglas.
Wayne - I just finished cleaning up a Black Vinyl covered '67 Hardtop that's now on my 66 and believe that all midyear hardtops fit all years. The only actual physical difference I've heard about is the 63 version and it has to do with, I believe, the area
near the back end of the door sill. But otherwise, your 64 top should fit your 65 no problem.
Mike T