Best source for aluminum t-stat housing?

I've been had by the parts store. I have one of these garbage made in China t-stat housings, and the pos doesn't seal worth a damn. I'm going to have to replace it again, and I'd like to get an o-ring'd aluminum housing. Is motion dynamics the only place that sells these?

Try Matt S, he has been able to get them in the past or maybe he can direct you to the source.
His e-mail address is;

[email protected]

I did make a group buy back in May, but didn't get much interest the 2nd time around. Motion Dynamics is only a couple bucks more than the price I was getting them directly from David, for a lot of 20, so it's not really worth much my time unless there's alot of people who want one.