These are what I used (mine are chrome):
https://www.americanmuscle.com/6spline-lugnuts-black-1516.html
They have taller ones also. MRR says that their wheels will take the regular Mach-E GT nuts, but my tire guy told me that, NO, the OEM nuts wouldn't have fit.
According to tiresize.com, that fitment should work. But here's some thoughts:
1. There's only 2 tires available from tirerack in that size, and one is a run-flat. I would never recommend a run-flat, due to the ride stiffness. With that tiny sidewall, you'd have iron tires.
2. There are...
I was the the first Mach-E EVER entered into a Mustang Club of America national competition, as a competitor (not display-only). Result was a President's Choice Gold Award.
BTW, so far, my range with the wider tires (275 vs 245) and custom wheels, has been reduced from 254-256 to 250.