Easy to find those (it's just a grey one right?).
Goto any wrecker with an e34- so long as it is not a tan interior, they'll have one. Key is to remove it without breaking it- warm weather, care are your friends.
Passenger side will be the best condition, but they last forever except one someone rips it up with undue force. I'm sure I have one if you need it- but airfreight is not cheap.