63 brake shoes are 9"x 1.5" (9" diameter drums). 64 and later shoes are 9.5"x 2.5" (9.5" diameter). Also, 61-63's have lug bolts on 4 1/2" pattern. 64 and later have 4 3/4" pattern. I think maybe the 63's (and earlier?) have left-hand thread lug bolts on driver side.
Seems like when I was scrounging up suspension parts I ran into a "Cadillac" idler arm that interchanged with a 63 Tempest and it cost somewhat less than the Tempest.
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