anchor.diff:  ZCG, Cagiva
   ZDC, Honda
   ZDF, Ferrari
  -ZD0, Yamaha 
  +ZD0, Yamaha
   ZD3, Beta Motor
   ZD4, Aprilia
   ZDM, Ducati
  
positive.code: 935, Citroen
  936, Peugeot
  93H, Honda
  93R, Toyota 
  93U, Audi
  93Y, Renault
  9BF, Ford
  
negative.code: 1GA, Chevrolet
  1GB, Chevrolet
  1GC, Chevrolet
  1GM, Pontiac
  1GN, Chevrolet
  1GD, GMC
  1GE, Cadillac
  