Factory tow hook mounting bolt location

[92470]

I have a set of factory tow hooks that I want to install on my 87' V10 this weekend. I bought the longer 1/2" grade 8 bolts and hardware that in an earlier post someone said to use. Now I just need to know what bolts do I take out that my new bolts are to replace to mount the hooks? When I look underneath, I just can't seem to figure it out. I'm thinking I take out the front bumper bolts that mount the bumper to the frame, but am not sure. Could someone please chime in that has them mounted and let me know?

Thanks!