Hello Divine and congratulations on your first TM post. Looking at the parts diagram, it's two O rings, one looks shaped but that will be the shape formed by the grove it sits in. I don't have any details on them but they will be standard Viton O rings. Now looking at the S&S parts book, the round O ring (item 31) is listed as size -017 and the shaped one (item 32) as size -022 but I cannot identify those numbers for sure. If you measure them up for section size and inside/outside diameter they are all available from a number of sources, such as eBay or Bearing King.
Once you know the sizes please let me know and I will add the details to the next list update. That won't help you but it will make things easier for the next person who has to change them for a leak and making M3W ownership easier is the idea.
