If you're friendly with a workshop that has a large scraps bin you can always ask to dispose of there.
Otherwise theres always the places like sims metal etc depending where you are at
https://recyclingnearyou.com.au/cars
Even GKTech's short nuts are only intended for 15mm spacers, and the OP's look like they might be only 10mm. So he'd have to rely on pockets in the wheel hub face to accept what sticks out past the spacer's face.
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