I have had good success with Schmiedmann in finding parts for my '85 635 M Euro.
For example, recently my ignition switch (32-32-1-154-094) shot craps and needed to be replaced. All US based suppliers indicated the part was NLA. Schmiedmann however, was able to source it from BMW and I had it in about 10 days.
Their website provides online chat and their sales reps are helpful and responsive.
If you have a Euro spec, check out Schmiedmann.com.
Schmiedmann.com
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Schmiedmann.com
1985 635CSi M Euro M88