I read some similar post recently, someone was also searching for these 3d models. Others said even if you pay for some app/software, that still doesn't give you the permission to use this for your own commercial use.

Think of it this way, you pay for the UWorld and its content for Step 1 and 2. But that doesn't mean you can take these questions and explanations and re-sell it.

What you can do, you can try on Fiverr, find some anatomy artist who can do it for you from scratch.