For the GU/GQ rear bump stop, go to wrecker and get some pathfinder (R50 from memory) rear bump stop. It almost bolt straight in (with hole elongated a bit). Simplest way to do it, nice and progressive too.
For the front get landcruiser (80/100 series)
REAR bump stop and bolt straight in. It the best beside pneumatic one. I made a mistake and got the front one instead, need to trim the metal part, but still work. Pedders make a red one too if you are after some blink.