"C4" suspension code on my fender tag

In 67 there was a Rallye suspension package which included 6 leaf rear springs, HD torsion bars, HD ball joints, and sway bar.

PXL_20231015_154258676.jpg

Might be similar in 68?


From 68 salesman's brochure
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A FBBO post says C is for suspension 624 is the Rallye suspension and standard on GTS, so C 4 makes sence