Where can I get, locking pins for rubber tires?

Now, you would think, this would be easy to find. But, not even Ebay seems to have these.

Recently, I got three solid-rubber tires for my e-bike, and none of them came with those locking pins that you expect them to have.

I have contacted the seller, they cant help me, Ebay does not have them.

Would anybody here have, perhaps a good retailer in Melbourne, from which I can obtain these from?
 
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