have my book at home and im down at school, need some help

[68chargerboy]

can someone help decode this vin, XS29L8B, i know the x is 66-70 charger, the s is for r/t, i dont know what the 29 is for, i know the l is for 440, dont know the 8 and i know the b is the assembly plant in hamtrack. so i just need the "29" and the "8"

thanks in advance

Zach

[carolina charger]

 29 = 2 door
  8 = 1968

[68chargerboy]

thanks!