'65 and '66 Chevelle housings are the same and have flat spring perches with a bolt that holds the spring in place. '67 is the same width at 60 inches, but has the later spring perch with the raised center. '68 to '72 are all the same and are 61 inches wide. All of them will interchange, but tire clearance may be an issue if you are using wide tires.
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Freddie
1969 Camaro RS/SS396 (427) 4 speed
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