Honestly, I'm not sure what tyre profile GTRs run so hopefully someone else with a GTR can help you on that front.
Just from the pics, they do look like a small stretch and at the end of the day, it's possible someone might have gone undersized for whatever reason.
Personally, I'd wait till they land. Nothing worse than buying tyres that aren't gonna work and then shelling out more cash for tyres that will. Besides, they're not gonna be a hard-to-get tyre so should be able to drive down to the local tyre joint and get them sorted.