I just got an aem fpr and it didn't come with an o-ring can i install it with the stock honda o-ring?

 

Does anyone have a suggestion?

 

If it's the OEM-style bolt-on one then you should be able to use the OEM o-ring. If for some reason the OEM one doesn't fit, just go down to the hardware store and get one that fits. That's what I did when I dropped my o-ring while changing FPR's.