The "replaces Ford 17562" looked familiar, the 17xxx base number series of Ford part numbers includes windshield wiper parts. The number does not have any entries in the 60-68 MPC, but it is possible. The AMK grommet, E6AE-17C431, does have listing for full side Fords, T-Birds and 66 on Fairlanes and Falcons under base number "17C431". The style did appear in one of the 60-68 MPC pages for full Size Ford - not Mustang.
If a measurement of the hole in the mounting bracket could be made, it might "enhance" the possibility that the grommet in the second picture (replaces 17562) might work. The 75 edition MPC was no help on either of those numbers.
Jim