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Here's some suggestions on what to do next. You probably have already thought of these things, but in case you haven't, here goes.
First, check the oil filter for debris. If its clear, that's a good sign. If it's filled with metal, then you'll likely find the IMSB failed completely.
Next, remove the flywheel and IMSB flange. Assuming it looks in good shape except for the broken stud, test the IMSB for play. It's a good sign if there isn't any play or its minimal.
Then remove the bearing from the engine block. There are many discussions in this and other forums on the proper procedure to remove the IMSB. Hopefully, there is enough stud length left to use the extraction tool. If not, others might suggest what to do if the remaining stud is too short.
Once the bearing is out, remove the bearing's inner and outer seals to see if the bearing's race and its ball bearings are intact. If they are, that's another very good sign.
Next, check the IMSB seat in the engine block to see if it was damaged. Hopefully not because it's not repairable if I recall correctly.
You should consult others more knowledgeable than me, but if the oil filter and bearing are in great shape other than a broken stud, you might have dodged a bullet.
Let us know how it turns out.
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