FWIW, on pg 72 of the Red Owners Manual (published 6/73), it lists 185-70 x VR15" fronts or C-60x 15" belted-bias, and 215-70x VR 15" rears, or H-60x 15" belted-bias, with 225-70x VR-15" optional rears. There are no tire sizes listed in the Blue Owners Manual (5/71 publish date).
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