Remove under body covers with 10mm socket wrench. Use flat head screw driver to remove push in clips.
Remove 12mm bolts from under the chassis and rubber caps that closest mid pipe. To take out 17mm sub frame bolts, I recommend long toque wrench. These bolts are very tight!
Place aluminum block into the hole that was covered by rubber cap near mid pipe. It's best to weld into the chassis so you can screw in 19mm bolts.
I found quicker way to do it. To secure aluminum blacks, you can use small strings, ropes or zip ties. Please look at photos above to see how I did it.
Once all bolts are in positions, tighten all bolts down.