They looked replaceable to me. I can't imagine they wouldn't be, but I am by no means the last word on this one.
You've probably been through all this, but have you tried searching the archives? Or perhaps you would find them in the catalog of an online parts store to confirm that they are available/replaceable.
Shame you can't find the culprit. If I recall correctly, you've been dealing with this problem for a little while now. What's the symptoms? My big nose usually leads me to a fuel leak...
Good luck,
Will
850 / Mini
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