Adam,
This is not something that us owners are just going to stash away in the garage. As I understand, all the ZF bearings are proprietary to ZF and are not sourced from your local bearing supply house. I imagine that Les has searched with the other vendors that do ZF work to see if they have one. You might ask to make sure, but you may just be at the mercy of time.
There was a poster on this list a while back over in the UK I believe that did ZF work. Perhaps if you can search out those posts you could give him a try.
Good Luck,
Larry
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