I see that they couldn't find anything like it either, as they link to the closest thing they could find.
Would this work?
https://www.ebay.com/itm/NOS-Rolykit...MAAOSwRo1af05c
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---------- Post added at 11:04 PM ---------- Previous post was at 11:01 PM ----------
It appears that this one can be locked:
https://www.ebay.com/itm/Rolling-Lar...8AAOSwqClarwWm
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