Are you looking for a holder with a magnetic back?
BCW now have a tobacco card insert that allows you to use standard size holders for Tobacco cards. https://www.bcwsupplies.com/tobacco-card-insert-sleeve
That might allow you to use additional types of holders.
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Working on the following sets: 1916 and 1917 Zeenut, 1954B, 1955B, 1971T and 1972T
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