They don’t appear to be available via the Chevrolet parts or accessory sites. You might check directly with a dealer since they do appear to be an option to add when buying a truck. Or the used market has them available as well.
I just bought the high clearance steps for my 2026. I was debating back and forth for a month on which steps I wanted. The steps were on Chevrolet.com up until 2 weeks ago and then they were removed. I found my steps on Facebook Marketplace. There were 4 sets available here in Colorado that ranged from heavily used to brand new (in New Mexico). Steps from a 2500/3500 fit as well.
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