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I found these in 20 seconds, I'm sure there's more .
https://www.rockwelloffroad.com/product-page/wilwood-2-5-ton-pinion-brake-kit-with-hardware
https://www.redbarncustoms.net/25-ton-rockwell-axles-and-parts/25-ton-rockwell-pinion-brakes-and-brake-parts/
https://www.beyondprecise.com/