Well, it's a 1.0 Micra I'm putting them into....
So it should be an improvment lol
Did they not fit into the micra fuel rail?
No.
This has been covered a million times. You CANNOT just bolt on EFI components and hope it will work. It won't. IT will ALWAYS need to be re-mapped to compensate for changes, only then will the chance of releasing extra power begin to happen.