There are three different oil seals for the M-18. The correct one for your Engine (M18S-24506) is:
X-583-5.
You can NOT order parts simply based on a group model number.
Don't ask me how I know this.
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Roland Bedell
CC Models: 100, 105, 1450, 782, (2) 784, & 2072
Buy: Made in the USA 