Ok sorry for the delay. We have a 6 week old so was hard finding time to get pictures over the weekend while we were camping. ha
So a word on the whole 120 lb vs 150 lb. I noticed when I took the sheets and conforter off when we were getting ready to come home (still a couple pillows on the bed and the mattress and the mattress topper) that the 120 lb shocks held it up just fine. So, take that for what its worth on if you should buy 150 or 120.
Here are some pictures of how mine are mounted.
Here is the whole shock from the side. I used the measurements someone else posted in an earlier post on here. I believe the center hole on the bottom bracket is at 28" from the outside edge of the end of the bed frame and the top bracket on the bed platform is 42" from the the outside edge of the bed frame.
How bracket is mounted to bed frame. Mine had a thin piece of aluminum looks like that wraps around the corner as you can see. I just drilled through this and put my bracket over it as you see. (oh, pre drill ALL your holes! As I'm sure you know, this wood is very light weight and will split easy if you don't drill first)
Here's how I mounted the shock to the bed platform.