Replace that sucker, your life depends on it. /www.motorworks.co.uk they are half the price of US, and Super Fast shipping.
Yep. Always amazes me that I can buy from Germany or UK for around half of BMW North America. That includes shipping!
I just bought a low comfort seat for half the price that I could get it in the USA.
https://www.schmiedmann.com/en/spare-parts-smc1-catn-ol
It is a German site but will ask you if you want English.
EDIT: I dont have your part number but this site lists 896.00 for SKU 36-31-8-538-086