For Sale is a brand new McCulloch sprocket as shown in photo.  It is for the mini 3/8" pitch chain, has 6 teeth.  The bearing is pressed in.  

This fits:
McCulloch Mini Mac 25, 30 and 35

McCulloch Mini Mac 110, 120, 130, 165, 2.0

McCulloch Power Mac 310, 320, 330, 365, 375,  510
McCulloch Titan 35, Titan 40
McCulloch PM480
McCulloch Pro mac 3205AV, 3200, 3214, 3210, 3216, 2316, 2318, 2000, 3000, 3516, 3505, 3805, 3818, 2010, 2012, 2014, 2016, 2116

This is "NEW OLD STOCK" meaning it has been on the shelf for 20+ years, does not have a package, may have a spot or two of rust on it, but it is in perfect unused working condition.