I mentioned this in FB but I'll mention it here to help the info get out. I had trouble replacing my rear lower control arm bolt with a longer bolt after welding on Eimkeith's LLS kit.

The bolt is a M14 bolt, and I bought a new M14 bolt. I went to slide it through the mount holes and the threads screwed through, like the OEM bolt, then the shank stopped dead in its tracks. After much brain racking, and measuring, I've determined that Toyota uses a Japanese Standard Metric which has a narrower shank than thread.

So on an M14 OEM bolt, the threads are 14mm and the shank is 13mm. On a normal metric bolt, the shank and thread is 14mm. The hole in my bushing was 14mm and for the normal 14mm shank fit just fine. What this tells me is that Toyota has designed these bushings with the "loose" tolerances. Why? I don't know...maybe less seizing?