I have been struggling to find proper exploded drawings on this great motor. There are missing seals/o-rings on the lower unit and I would like to find exactly what's needed and where it goes. Is it possible to use a 1958 repair guide? I know my prop and other parts are the same, does anybody know how different the '58 was from the '55? The manuel is available at my local library so I was trying to avoid the expensive service manuels from 1955. Thanks for any help!