I broke one retaining bolt. One of the two retaining bolts. I had the same leak issue. Must you purchase a nissan produced bolt to replace it? Salvage yard? Or can you go to a hardware store/shop that sells bolts and screws. There are some here that have quality bolts for auto replacement purposes. I ask because the center portion, along the length of the bolt, for some reason, is thinner and has somewhat of different thread spacing. The end of the bolt, in other words, bulges out - is larger. Not sure why.