FI’s are an interesting wheel. Dimensionally they’re the same as the DC/DG twins and the later YS B-body wheels. Colvin’s book lists the FI as being for wagons. If you look, you’ll see that FI Rally’s are RIVETED while the others are WELDED. There must be a reason the engineers chose this, but it’s interesting to me that FI’s were in production as replacements for 15x6 Rally’s into the 1980s.
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