Another fit for the Swingline, Surebonder 44012

https://surebonder.com/products/44012-5-heavy-duty-wide-crown-staples-1-2-length

And these, 10000 per box 80 series staples 1/2 inch Crown, 1/2 inch leg, 20 gauge. Galvanized. 10,000 staples per box. Spotnails brand.

https://www.stapleheadquarters.com/ItemForm.aspx?Item=P80-12

Amazon meite 21G80S12 21 Gauge 80 Series 1/2-Inch Crown by Leg Length 1/2-Inch Galvanized Fine Wire Staples Upholstery Staples (10000pcs/Box) (1)

The gauge is 21, versus 20 for the one above. 20 gauge is a stronger staple.

https://www.amazon.com/meite-21G80S12-Galvanized-Upholstery-10000pcs/dp/B00XJH2WUC/ref=sr_1_2_sspa?keywords=80+series+staples&qid=1671657681&sr=8-2-spons&psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUEzVVkwM1BXMFBBQVlRJmVuY3J5cHRlZElkPUEwNDc3NjAyMjRaQ1RONjE0VVFLUCZlbmNyeXB0ZWRBZElkPUEwNTAwNzgzQ1A0N0xDODhIOEZVJndpZGdldE5hbWU9c3BfYXRmJmFjdGlvbj1jbGlja1JlZGlyZWN0JmRvTm90TG9nQ2xpY2s9dHJ1ZQ==

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Here is another, Paslode 1/2 by 1/2,$8.54 for 5000 staples, 20 gauge, a better fit than a thin wire staple, which might shoot out more than one staple.

https://www.zoro.com/paslode-galvanized-staples-12-in-l-5223/i/G800933000/