Re: 1961 evinrude lark 3 engine cover seal
If I understand which seals you are describing, some members have reported successfully using automotive-type vacuum hose to make replacements. Although I have not tried myself, they reported splitting the hose so it would fit over the lip of the cowling. You may have to experiment with several different sizes to find something that is satisfactory for your needs. Good luck and let us know what you find!