I've been doing some work on my JDM Evo 8 over the last few months, replacing diff bushes and troubleshooting the AYC system. Yesterday while cleaning up i went to empty out my oil drain pan when i found a rubber seal (?) at the bottom of the pan which i have not seen before. The car is back together now and I'm worried this may be something important that has come off the car and fallen into the drain pan without me noticing so hasn't been installed back. For context I've only been working on the rear end, i had the subframe out, AYC pump, drained the diff and AYC fluid etc. Its entirely possible that this part is not even from the evo as I've worked on other cars in this time, but just thought I'd ask to see if anyone can recognize it here. Thanks for any help