Every bushing listing says "all Buicks 1967-1974" or '76. I wonder if this is more generic than it seems. I'm getting used to the 1966 Electra being overlooked in the parts catalogs.
Examples:
The four support bushings for the radiator, 2 top and 2 bottom, are very common throughout the GM cars. (Famous last words ) but, I would not be afraid to order some. Now someone can chime in and tell you different!