Can't tell how deep the notches are but if they are deep for a cotter pin to lock, check out McMaster-Carr and their selection of castellated nuts. If the notches are shallow or very thin check out AMK products. Look in their bulk catalog on page 47.https://www.amkproducts.com/wp-content/uploads/Catalog_BulkFastener/BULK_39-54.pdf
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