Good day David here, I previously posted about my Stihl 08S , and thanks for the help, subsequently I have discovered that the saw has in fact got 2 drive sprocket options , 3/8 or 404 , please if someone can help I would like to know what bar will work with a 3/8 drive sprocket , I would like to use an 18" or 20" bar and chain, thanks regards David.