I’ve had my one drop out in the past, I ordered a replacement from spares department at MMC. They will post it to you if requested
Spares department don't have any in stock unfortunately. I managed to find an M10 Aluminium spacer 45mm long with OD of 19m on ebay which sounds about right.
When I bought mine, I found a secret checklist hidden under the leather panel on the dash from a previous owner. First stand out item on the list was - check fan bolts! I'm beginning to understand why it was on the list now
The screws are loctited into position which creates its own issues - regular check tightening is the answer
Make sure when you remove the bolts that you use a flat bottom tap to clean the threads in the heads and a die to clean the bolts before you reassemble with more locktite.
The light at the end of the tunnel is actually a train. 2019 M3W
I have always used Loctite 243 on the fan housing bolts and not had any problems with them coming loose or removing them when I have needed to. Not sure what the "issues" are Mark?
