Many thanks I will check it out today 

optimistique1 said:I was thinking about putting something either around or under the replacement motor to try and keep it dry this time as the sponge is useless. I have a friend who works at bmw and I can still order the tail light but it's over £300 so I'm waiting on a decent used one coming on ebay. Replacement motor and pump ordered for just under £600 so hopefully get it fitted next week and hopefully that's the end of it ...
Stash36 said:That drivers side, light looks like it's been under the sea.
I have a perfect right side rear light from my 2009 car for sale, pm if interested.
Stash36 said:Yes you can get the motor support, part 51 47 9 139 043, was about 18 quid from BMW when I bought one about 4 years ago.
I've been on the saga you have, wet boot, rusty motor. Robbiz4 is the expert on here, he has rarely seen a pump fail, swapping the motor only will probably fix it. It only has two bolts holding it on, easy change.
I've sent him a PM about getting just the motor replacement instead of the whole pump and motor as it would save me about £200...Chippie said:Search RobbiZ4 he is the man.
Chippie said:Have a read of this post re: having rear light repaired
https://z4-forum.com/forum/viewtopic.php?p=2054190&hilit=Rear+light+posted#p2054190
And his eBay advert
https://www.ebay.co.uk/itm/296159720822?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=-yzE5g7VSm6&sssrc=4429486&ssuid=JZNgRjNbROm&var=&widget_ver=artemis&media=COPY
£133.50