Early in the '71 model year, 15" Honeycombs were not available and were substituted with the 15x7 Rally II's on all Pontiacs. In January, 1971, the 15" Honeycombs became available. At that point, the Y99 package on Formulas came with your choice of 15" Rally II or 15" Honeycomb wheels. When ordering this option, the dealer had to specify which wheel the customer wanted (code 474 or code
478). There was a difference of $36.86 for the Honeycombs over Rally II's when ordering the Y99 option.
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