What I think might be different on a Superbee is that they usually came with F70 14 tires standard instead of G70's. I'm gonna say that W would indicate the car line (Dodge), and the B would most likely stood for B-Body. Not sure why the lines workers randomly wrote W or B before the tire size. Your guess is as good as mine on that one. Is your (extremely) late built Green bee coded on a buildsheet T46 for the Dual White Stripe Tires? Another interesting note on my old B-5 Blue R/T, it was coded 74 on the buildsheet for 14X5.5 Magnum Road Wheels instead of the usual wider 14X6 ones. Must have needed the skinnier rims for the G78 series tires.