We have an elderly Sebo vacuuum cleaner that began behaving intermttently.
Being a psychic genius I decided it must be the motor brushes (without checking you understand). I ordered against the advertised model number and was delighted when replacements arrived very quickly.
When I dismantled the machine I discovered that although the carbon elements were pretty much the same, the housing was totally different. The installed ones were mounted in a metal sleeve and retained by raising a metal lip after insertion in the motor housing.
The received brushes were mounted in a thick plastic outer that had to be screwed into place. A YouTube video shows them clearly.
I had extracted one of the installed brushes and photographed it adjacent to one of the new ones and sent picture to the supplier assuming that they had sent the wrong item.
They promptly replied asking for the part number on the packet.
I photographed that too and sent them the image.
Their reply was that they had taken advice and that the replacement should fit. I wrote back inviting them to review my first picture and pointed out that is inappropriate to try to fit a square peg in a round hole.
They then offered me a refund provided the package was undamaged, that I supply a copy of their invoice and returned it "signed for".
I will not be doing business with Spares2Go again.
They are probably in breach of provisions of the Sale of Goods Act but I am too lazy to check and challenge them because ultimately the cost / benefit would not be in my favour.