Both of my radiator cap housings are bad. One has a broken plastic overflow coming out the side, and the other looks like it was tightened too much and it cracked around the bolt. The shadetree's JB weld did not hold. Anybody got 2 housings they could spare? Also will depend on S & H charges. These canget ridiculous sometimes.
I am really going to enjoy this car after all the bugs get worked out. Never thought I could speak Japanese. Roaryエンジン転向者． しかし私はまだIH偵察兵〔スカウト〕を愛しています！HAHA

 

The dealer will stock replacements.

Since you didn't tell us what year the car is, we can't offer any other suggestions.

 

You might want to post in the parts for sale/wanted forum. There are separate ones for each gen.

If you need a new one you can always give Ray Crowe at malloy mazda a call, he can hook you up with whatever you need. Very well respected guy here.