I hope you didn't get cylinder bars. The rasp bars you want are for the old closed concave area of the old conventionals. There was the option of replaceing the channel iron concave bars with rasp bars. I'm sure they were made in various lengths for all the old closed concave Gleaners. Its just the name stuck for the F2 rasp bar. I'm sure it was tbran that first mentioned them when he found them on his shelf and stuck them in. They worked well right off the bat to control some lose he was having. Take care.