The indicator stalk in my series 3 was getting a bit tired, so I bought a new genuine one.
eBay, don't you know.
Lucas, green box. It felt genuine.
It might well be genuine, but it didn't fit like the original. Nothing major, but annoying.
The wiring was all good, similar colours, correct plugs and sockets, same gauge.
The castings were fine, and the contacts looked sound.
There were two problems:
The bracket wasn't for a series, too small and no clip for the shroud attachment, the set screws were too short. No problem, swap the old one over.
But the biggest problem was the stalk itself, this was massively out of line compared to the old one, and a sod to bend right.