You see, I'm wanting to drop a few teeth from the rear sprocket on my SL350 and I need to know IF the sprockets from the CB/CL350 (or any others, for that matter)will bolt up on my SL wheel. The '72 SL350K2 carries a 42 tooth rear sprocket and the K1, uses a 40 tooth, but I haven't located a K1 rear sprocket. So, if I could find out what other sprockets would work, I could have a better chance of getting a smaller one than I have AND be able to cruise easier, with lower engine speeds and should still have enough power to plunk around off road. Thanks for any input here, Bill