The Chevelle 12 bolt should be a bolt in replacement for your Buick. There are actually 3 different Chevelle 12 bolt rear ends. There is the '65 and '66 12 bolt, which is 60 inches wide overall with flat spring percehs, the '67 Chevelle 12 bolt, which is also 60 inches wide, but has spring perches with a raised center, and there is the '68 to '72 Chevelle 12 bolt, which is 61 inches wide over all with the raised spring perches. You will need the '68 to '72 rear end for your car. There is a chance that your u joint will not be the same size as the Chevelle yoke. You might have to get an adapter u joint to make it fit.
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