Thought I'd keep the goofy question trend going here. I'm hoping someone has a magic database of information. I am trying to ID the pistons in an engine that I'm not planning on taking out to accomplish. I can clearly see a part # stamped on each piston bottom but I can't find any info as to what they are. These pistons are probably 10-20 years old and that's about all I know. Can't see any other markings and I'm not going to spend needless money to buy new head gaskets that don't need to be replaced just so I can look. If there's anyone that might have an idea as to what these are, your insight would be greatly appreciated. Not expecting a miracle but hoping for the best. The part/id# stamped on the bottom of each piston is AR 013-99. I can only think of Arias??