Looked this up in my 70 Assembly manual, it shows the following:
482400 KM (D/WS4, W66)
428399 KN (W/WS4, W66)
On a couple of 70 Van Nuys build sheets that I have seen it does show the KN on a couple of Formula's and a KM on a Esprit listed in box 105 "Tire Press. label". Not sure what the difference would be, but would imagine it deals with the F60-15s since those wouldn't be available on the base or Esprit model.
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