I'm no expert either, I was just looking for some details so I could try to help.
I do not know what the Simps spread sheet is. or What number you had.
Nothing is obvious with your picture, I can only see one side, and you did not say that was your truck(to know you looked on the other side).
You didn't say you looked in the TM, and what you have didn't match your truck.
Like I said, I am only rebutting all this because I always seem to get flack when All I am trying to do is help you(and help you use the website). If you had included the info in post 3 in your first post, it would have helped (not being negative, just stating a fact).
Please don't think I am not trying to help. That's all I am doing.