Frank probably has something else but I found one here. http://www.everythingoutboards.com/brp/brpnumbers.html
After you asked for the number I started searching for "OMC Universal Puller 378103" because I’d like to get some spare washers and screws for mine too and I came across this site.
I often see OMC tools on ebay I’m not familiar with but the seller has the part number of the tool. This site has a link to all the numbers with a brief description/application/picture.
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