Here's the scoop on hardtop/convert windshields.
Does not apply to Imperials:
All 57 hardtops (2dr, 4dr) used a NAGS 451
windshield
In 58, all but Plymouth switched to the NAGS 453 windshield
In 59, Plymouth went the the 453 windshield
All 57-59 convertibles used the 453 windshield