Leaking Thermostat Housing. Thinking on billet with O Ring

Glad your happy with the o-ring.
Having said that, Why did you continue to use the chrome Chinese housing, which pretty much everyone
knows leak ?
You went through gasket after gasket, and continued to use the same chrome housing, for years. No wonder you had a leak.

Hundreds of thousands, of stock housings, installed correctly, work leak free. Just dont want to mislead anyone, that the expensive o ring housing is the end all be all. Get a stock housing, install it correctly, and your good to go.

Anyhow, glad your problem is solved.