My idle speed thermowax on my TB has a small coolant leak. I replaced the O-ring with the one from my spare, but it only slightly improved it as both o-rings were hard. I checked out the Mazda parts diagrams, and it looks like the O-ring does not come seperate. Has anybody had any luck finding a replacement o-ring?

 

Any oring from a hardware store should work fine as a replacement

 

I just took the O-ring out of my spare TB, and it is a square o-ring, that will make finding it rather difficult.