X51 R2, why doesn't Dell sell a 330w power brick?

Hey so I saw the most recent forum from October about upgrading the graphics card and needing to upgrade the power brick as well. I'm in the same boat. I only have a 240W, want to upgrade my GPU to a 1050i but can't because of the power supply.... But Dell does not sell a 330W. I cannot find it anywhere on their site, and based on reviews on Amazon, I don't trust third party vendors either.

Has anyone had success with upgrading their X51, and can you direct me to a legit seller?

This is the only one I can find. https://www.amazon.com/gp/product/B07DCT39S9/ref=ask_ql_qh_dp_hza

Thank you