@Ross Stevenson,
Please note, Broadcom only hosts the latest OEM custom ISO per vSphere version (e.g., 8.0U3 4.3.6). and Cisco, as the OEM, is responsible for hosting older custom ISOs (like 8.0U3 4.3.2)
Well, what you could do is maybe
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and search for your specific UCS model and ESXi version. Sometimes older ISOs are tucked away in model-specific documentation or firmware bundles.
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Use the UCS HCL Tool The can help confirm which ESXi versions are supported for your UCS hardware and may link to matching ISO versions.
Or Use a Previous ISO + Patch If you can’t get 4.3.2, consider installing the closest available Cisco custom ISO (e.g., 8.0U2 4.3.2 if available) and then patching it to 8.0U3 using the VMware offline bundle. This is a supported path and often works fine for UCS compatibility.
Lastly, you open a TAC case or reach out to your Cisco account manager. They could provide a direct download link or internal access to the ISO you need.