Leaky C85 Oil Sump Drain - Fix?

most of the drains use a odd ball sized O-ring, better to replace the drain.

Now that I'm getting familiar with the old girl,  I'm working on a few issues.  The majority of my after-flight oil leaks seem to be coming from a leaky oil drain. It makes a bit of a mess as there is a good amount of oil that drips down the nose gear onto the tire.  I was planning on doing my first oil change soon and I hope to fix the issue.  Should I replace with new/old stock such as this ?  Or should I just stretch the spring a bit or replace o-rings?  Is there a better solution replacement part?