hello, new member here. i picked up a nice husqvarna 455 rancher with 20" bar on craigslist for cheap, but the chain on it is toast. per my research, the stock chain for the saw is 72 drive links, 3/8" pitch, and .050" gauge. however i think the markings on my bar indicate otherwise. can someone please tell me what chain the bar is calling for / what the markings mean? here are the markings: SN A 20/50 058/1 5 3/8 72DL 107800 GE MADE IN CANADA i think i have it figured out, but want to be sure before i order a chain. thanks.