For a wheel replacement, you just need to find a lug pattern that matches, hub bore size large enough to fit your existing brake rotor, and wheel offset and backspacing to make sure everything clears during steering and suspension cycling. Steel wheels are popular due to the geometry and brake clearance available.
The hubs you show above are for a C10 truck, and are a different lug pattern. So... worse than what you currently have.
A bit of research located the Corvette spindle upgrade for Mustang II from Classic Performance Products. I have no experience with this company or any of their products. The article suggests this may be worth a call to the company.
http://teamcpp.com/2021/04/new-product-corvette-style-mustang-ii-spindles-and-hubs/
