Dual point distributor ID question

#37 – At least Alan explained the redundant part number issue. To me it seems totally weird that they would put a different part number tag SCREWED to the BODY of the distributor just because they wanted to stock a replacement WITHOUT rotor and cap (how would the guys who assembled it know whether they were selling it with a cap on it or not?). I mean, every distributor actually installed on the production line had a rotor and cap, obviously.