I own a '66 Buick Wildcat and the front coil springs are unique to that year and and model. Plus, the two front springs are not an exact match and they have different dimensions -- left on the left side and right on the right side. Hence, they need to be special ordered and I have always had great results with: Coil Springs Specialists in St. Marys, Kansas. Here's a link to their website and good luck.
http://www.coilsprings.com/default.aspx
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