Quick Fender Tag Decode Help Please For 1971 Dart

Below is copy of fender tag from a '71 Dart...can anybody tell me what the "FO9" is for?

Thanks....Bryan


R11 V5X END
H51 J31 M21 M25 M31 M43
V1X U F09 F11 G33
GB2 H2B2 GB7 707 312780
E24 D31 LH23 C1R 306026