Pardon me, I haven't been on here since I sold my Nismo and I'm sure you've figured this out by now, but I bolted it to the floor board of the car and with it sitting directly behind my seat, it never budged.
The pic I posted up in nismo pics has swift springs, 15mm spacers with extended studs on all 4 and 1.4/1.6 camber front to rear. If you put 15mm on and get springs there is almost 0 gap in the rear and a little in the front but the springs still have to set.
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