I was able to get a 302495 for my QD15 at marineengine.com. A bit pricy I will say, the suggestion to search the SKF site is a good one.
If your o-ring is the same as mine, it will be a 302493. Frank might be able to verify that for you. I found a good source on flebay, about $9.
Good luck
Best Regards
John Gragg
RIverside, CA
Just starting in the hobby, please be patient.
48 Sea King 5hp GG9014A. Sold
49 Sea King 5hp GG9014A
48 Johnson TD20. Sold
49 Johnson TD20. Sold
54 Johnson QD15. Sold
55 Johnson CD12. Sold
57 Johnson RJE-19M
57 Johnson RDE-19
