Fuel Strainer Kit
 

I recently replace my fuel strainer with kit 3845400-S. This is a Fleetgard part. After taking the assembly apart, I realized that you need a second square section o-ring to seal the fuel heater. Without buying a second strainer kit, is the o-ring available to be purchased separately? The strainer kit description gives a part number of 3842021 for the o-ring,but when I inquire about the number, the supplier can't help me. I don't want to purchase a fuel heater element for the o-ring either. Anyone know of a supplier for this o-ring? Thanks.
Chucks