I bought this item to fit my 1968 CD175a. (sloper engine) As yet I have not fitted the item. However, it does seem to be well made and the thread is correct, the only difference between this and the original oil drain plug is that the original Honda plug has the recessed rubber O ring seal which fits into a slight recess on the bolt and a similar one around the drain hole. This non O E magnetic drain plug has a "soft" white metal alloy washer instead. Not sure whether that will work. I will post another comment after I have fitted it after the next oil change in about a couple of months.