This might not be the correct forum but I thought I would start here. I have an older Poulan 2375 that was pretty simply to replace bars and chains. There didn't seem to be options for sprocket, bar or chain DLs. I was trying to buy an extra chain and bar for my new 450 but I ran into too many different length sizes and heights for a 20" chain (that came with it). My bar states 80 dl so I believe that I am suppose to buy a chain that has 80 dl. Are the sprocket, bar and chain suppose to match? I never had to deal with this on my older Poulan. Thx!!!!