The coils would be a direct fit. If you were to use the 2012 fj shocks, those would require modification.
Thanks for the reply. What if I went with the 5100's?
Yep, 2012 fj coils on the 5100s made for the 4th gen will bolt right up, several are running that setup.
Thanks for the info ARK_SWAMP_RIDER. I did search but couldn't find much info on the 2012 springs. I see that some folks mention that you have to mod the fronts springs for 2010+ but I can't find any write-ups on that mod or what it involves.
The mod is only for the shocks because the lower mount is bigger than the stock 4runner shocks. If you are only planning to use the coils from the 2012, no modification is required