If you change your mind it will be cheaper to buy a 20" bar later. Typically easier to find bargains as well on 20" and shorter bars.
Hell, if someone wants a factory Husqvarna 20" bar for their 372, I have one in the barn in nearly unused condition. It is not a laminate, either. PM if yer interested. I would trade it for a 24"/84l loop of skip tooth square grind(http://www.baileysonline.com/itemdetail.asp?item=ORF 72CJ084G). I have no use for a 20" up here.
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