Well, for something that was going to be simple, this has turned into not so simple. The 117 military rivets I have are extremely hard (almost impossible to upset- 70 plus years of aging have hardened them well). I have 117 rivets that I have purchased recently and they are hard, but useable "as is", not so with the military rivets. Because I am using 5052 sheet in a salt water environment, the 117 rivets will have an electrolytic reaction with the 5052. 5052 rivets are not available through Hansen. 5056 are available, but they are used for magnesium alloys. What is available is soft 1100 rivets. Have not found any supplier with 6053 either. Well, maybe it is time to have my second cup of coffee before a decision can be made....