I have a 76 xl175-the Blue model - with a cracked exhaust valve guide and when I search for one I end up with -Not available.  the honda part number is 1205-362-405.  I have found some on e bey for a 73-75 model and the number is 1205-362-305.   I saw one listing that  said(?)the 305 number was replaced by the 405 number.  I need some good help before I buy.  thanks