From what I have read in the past, anything connected with Playmobil is assigned part numbers from the design department. This is done to be able to keep track of stock quantities. Even the brown card board shipping boxes with Playmobil on them have part numbers. At one time German DS made adult hair pieces available directly from the factory by researching production diagrams, but out of country DS department's were not permitted to order them, saying they came on the figures only. Now from what I understand unless shown as a replacement part in instructions like the hair salon, it is near impossible to acquire wigs from figures separately. Another reason there are part numbers assigned to all inventoried parts is for quality control & safety evaluations. If there is a problem found in the production of XX XX XXXX part number, they can fix the problem & keep track of future situations through ongoing inspections.