Could it be that the manufacturer receives 'sub-assembly kits' (as boxes of parts) from various different suppliers and then assembles those boxes of 'Parts' to build the device?
They then sell us the 'sub-assembly kit' rather than the part - because that is how they buy them in.
If this is the case, they need to give us a list of their 'sub-assembly kit' suppliers so we can get those 'original' parts... or the manufacturers need to look at the feasability of supplying 'sub-assembly' parts.
