don't do it....
Been running my 4R now for a year and its hands down my fave vehicle I have ever owned. Literally I was just like you, upgraded to the 4R and wanted it lifted without going away from factory suspension... in the end, I spent well over $5000 experimenting with several different options and by the time I was finished I ended up just going with Bilstein 5100's with a 2.5 front and 1.5 rear.
I did run spacers in the beginning and it was the worst experience I had with suspension. It did not change the ride in any way on the highway, so if someone is arguing that, I would argue they don't actually have experience with spacers. The main issue was noise and durability when in aggressive articulation and off roading.
A spacer set up will only do on the 4Runner if you intend on keeping it parked in a mall. The second you start going on the grass and gravel, your going to notice the clunking and movement they hinder or create.
hear is a write up from me about a year ago on the daystar spacer kit.
HERE
Long and short, your not going to find a spacer kit that provides off road quality lift. if your actually going off road, stay with the factory lift on the factory suspension or go full new suspension all around... if your not off roading then you should be ok with the spacers.
