Door lock freeze up on my X5 2004
 

I know this is a common problem, about the doors / locks freeze up in cold weather, and I know its a DUI solution fixing this. But dont really want to go this far to open all the doors, remove the airbag and the isolation.

I thought I saw a place here a while ago (tried to search) it exist two version of the BMW locks, one regular, and one isolated lock for cold weather. Does anyone know if this isolated lock exist, and if so whats the product number?