Interesting that the gears are still available. They are stripped out in my 8520, only one gear is actually missing any teeth if I remember correctly. I was planning on making my own replacement gear, but I might just rethink that a little bit, depending on what they cost.
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I know the thread is a bit old, but I just got a quote for the gears. They are in stock and expensive. I am waiting for stock to come in and I will be making a few sets of these if all goes as planned.
341-020 Each $125.76 GEAR990-066 Each $228.20 COMPOUND GEAR ASSEMBLY
990-065 $75.60 12/48T COMPOUND GEAR ASSY