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I haven't seen that gear for sale anywhere, only the odometer gear. May want to try a used part, or call a shop that specializes in rebuilding VDO gauges.
I have rebuilt quite a few of those speedos and I have seen that gear strip out before. Not really sure what causes it though. I have never been able to find that gear anywhere. If you can't find one I have a good used speedo for $75.
contact VDO in california, they might be able to refurbish your odometer and fix stuff thats wrong with it including the gear and other things that you think is in working condition but is not up to standards. worth a try, maybe?? but kind of pricey, at 140$ on average....