Correct/Original Rally II Rims on 1968
Short answer: For a 1968 Firebird with factory disc brakes, the correct Rally II code is “JC” — the same as drum brakes. You do not need a special disc-brake wheel. (The “JA” you were quoted is the GTO disc code, not the Firebird’s.)
Proof: the 1968 Service Manual lists JC for the disc Rally II; the broadcast sheet lists JC for all Rally II applications; the 1969-dated Parts Book lists JC for all 1968 Firebird Rally IIs; and original unrestored cars wear JC. (With wheel covers the rim is “HK” vs. the standard “HG.”) Even DeMauro’s Firebird Decoding Guide lists the wrong code (HK). JC clears the disc calipers fine — and is cheaper than the JA dealers push.
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Content last modified: June 13, 2026 at 10:06 am
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