Fuel pump o-ring

[Audifan]

I finally got my fuel pump assembly out yesterday and ran into a problem. I need to replace the big o-ring that sits in the groove of the top half of the fuel pump housing assembly. My fuel pump gasket kit didn't have that one. Is that o-ring still available to purchase? Also my fuel pump gasket kit didn't have the o-ring for the fuel sender cap. I did find a part number (4D0 298 135 B) for that which is called a repair kit where you get a new sender cap and o-ring but it's no longer available