The uppers are same as '73 . The lowers changed to 9/16 around Feb of 1973 from my research. Del~A~Lum bearings give the suspension a very FAST reaction time and much improved ride if you want to use a taller tire with no side wall. I had to paint my bearings black, as they only had Blue anodized when I bought mine.
You could have original lowers on your car..
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