You are out of luck. Until RemArms starts turning out spare parts there are none available anywhere to the best of my knowledge. You’re options are to wait or have a Sako or AR style extractor installed.
Agree, no parts, that is my fear. You would think spares would exist in Remington's warehouse somewhere, but I digress. What's caused my problem is blown a case head damaging the extractor. Peppered my face pretty good as well, enough to cause a good run of blood down my face!!! Eye protection did it's job. I did find a NOS replacement on ebay, I was desperate, so pulled the trigger. We'll see if it's a fix or another lesson learned.