I'm restoring an old aluminum fishing boat and need to replace a seat that was removed by the previous owner. The plywood seat is held to the side of the boat by aluminum brackets/channels. I have to to refasten them to the sides. The old one were riveted to the boat. I want to avoid a dissimilar metals corrosion problem. I have not found any aluminum rivets yet and if I do find some I have never worked with them before. I have aluminum "pop" rivets but they are hollow and might allow water to enter and attack the wood seat. Any other way I could do this? If I used stainless steel bolts would there still be a dissimilar metals problem? If I need to use solid aluminum rivets, where can I find them?<br /> Thanks