Sticker bottoms - Subfile or Primitive

[Magnus Forsberg]

Needs to be all lower case so I'd suggest "sticker-back-<...>"

Let's go with something very simple like "sticker-back-[partnumber]-[a-z].dat"
I don't think many parts will have a need for many backside shapes. Maybe [01-10] is enough, instead of [a-z]?

Or a simple suffix? Maybe [partnumber][b01-b09,b0a-b0z] where "b" stands for "back side"?

I see no reason having a full description of different details in the filename.  That belongs in the description of the subpart.