It will be an ugly fit. The center (under the grill) section will be fine but the ends( where the turn signals are) on the 64 go upwards while the ends on the 65 go down. So you will have a couple of inches where the bumper and the front fenders want to take up the same space.
Don't believe a 64 will bolt up. The bumper turns way up on the ends and will likely contact the fenders hard. Find yourself a 65 bumper, you'll be much happier.
Every thing on the front end is different. Bumpers fenders grille mounts, and rad support is different. Get a 65 bumper.
Hey Joe haven't even had her uncovered in a few weeks. The Buick Police are going to pay me a visit and kick my a$$. House projects are taking all the spare time Come out sometime and paint my driveway :3gears: