Dear @ericsch : I tested all these and even the Ikeda all silver that's very good as the cooper " brother ":
https://www.ebay.com/itm/Ikeda-S40-Cartridge-Copper-Leads-MADE-JAPAN-/282890456369?hash=item41dd95cd31
https://www.ebay.com/itm/SME-5899-vdH-MCS-150-Wire-Cartridge-connection-leads-/273788176403?hash=item3fbf0c0813
https://www.ebay.com/itm/New-Oyaide-HSR-AG-5N-Pure-Silver-Headshell-Leads-F-S-from-Japan/233219643836?_trkparms=aid%3D555018%26algo%3DPL.SIM%26ao%3D1%26asc%3D225074%26meid%3Daf58f1497a064789b39c4911210b6b21%26pid%3D100005%26rk%3D3%26rkt%3D12%26mehot%3Dag%26sd%3D174204263341%26itm%3D233219643836%26pmt%3D1%26noa%3D0%26pg%3D2047675%26algv%3DSimplAMLv5PairwiseWeb&_trksid=p2047675.c100005.m1851
https://zavfinousa.com/collections/vinyl-accessories/products/cryolitz-ag-pure-silver-headshell-leads
R.