Suggestion from Matt of White Horse Bricks, in response to my query below:
It would be great if they could be listed against each other as 'alternate
part numbers' in the same way as some parts do.
It would need to be in a way that the search engine and wanted lists point to
both so that people searching in sets get the part listing and vice versa.
Original Question from OOO_Shiny:
I have several new, sealed power functions pieces. They have a set number, and
then a different part number, but it is the same single item.
If a buyer is looking for the part, will the single part set also appear? If
not, how do I suggest an addition to the listings pointing out that they are
the same?