64Convs, I agree that SMS is your best bet.
The '64 Impala pieces may or may not "fit" from a dimensions standpoint, but they certainly would not look correct for a Buick.
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Brian Laurance, BCA #5168
'59 Buick Electra 4-door hardtop
'71 Buick Centurion Formal Coupe
'89 Buick LeSabre Limited Coupe