Looking at possibly buying an 590 echo I hear really good things about them but I want to change the bar on it to match my husky 55 and dolmar 510 what bar would work I just want it easier to buy chainsaw swap them around my friend I cut with also runs the same chains so makes it easier if we have an issue plus we buy in bulk sizes are 20 72 teeth 050 3/8 and 18 68 050 3/8 thanks