Good point mol1jb, I ran into an issue when I ordered a new set of pans. The original ones were Leader and I just ordered based on what Leader's labels said they were. The originals were marked 3'x2' syrup pan ans 3'x6' flue pan. I changed the ratios and ordered 3'x3' syrup and a 3'x5' flue pan from Thor. When I went to put them on my arch, my new pans were 1.5" too long, even with the gasket between them 1/4" instead of 1" on the originals. I then measured the new ones, they were on exactly. I could not measure the old leader pans because I had already sold them. I then had to lengthen the arch 2" to make the new pans fit. Leader does not label their pans at actual size they round up (a lot).