Your VR4 heavily modded?
Have not use NGK7 before but have tried Denso Iridium IK22 which is about NGK7 heat range. To me not much difference since my VR4 is standard stock engine. Currently using back NGK6 heat range only....
finding tis small rim nut 12x1.5 is 7point
many shop is sold out because old model 2 years ago i lose tat nut lock
i need nut lock.i can buy full set again if get it...