I could have sworn it was just 2 bolts holding mine in when I had it out, there was the harness electrical connection and the big wire https://cimg5.ibsrv.net/gimg/g35driv...0e80728dcc.jpg
bolted one on the side. Mounting bolts was one that had the electrical connector harness bracket and the bolt right BELOW that one just like shown in your picture. I still think the issue is all that corrosion on the lower bolt, you obviously have an electrolysis problem causing the metal to decay like that.