Body-colored 14x6.0" wheels w/hub caps were STANDARD on a '70 'Cuda.
W11 = deluxe wheel covers were a $21.30 OPTION (shown above).
per GG's "cuda Options & Accessory book" - US spec.: BS23_0 w/W11 ~ 886 cars & BS27_0 w/W11 ~ 46 cars.

OPTIONAL W21 = rallye wheels $43.10 and/or W23 road wheels $86.15 would've been 14x5.5".