ANOTHER THERMOQUAD QUESTION

A common size & should be readily available where O rings are sold.
Geez, I made 10 phone calls and stopped 4 times while I was in town today.......Nothing!

Looks like those O rings need to be of the Viton variety. I found a supplier on line of Nitrile, but they are fuel resistant to AV gas, and not automotive...........I assume it has to do with the Ethenol in our fuel.