Don't really want to buy generic because it is not something I enjoy replacing in the next several years, but what about anything from D, H or K series? anything that will fit?

BTW, I guess Honda dont make their own so who do they buy it from? If denso or GQ make them I guess buying them from Autozone is fine, right?

 

I replaced mine with a CST thermostat -- im sure you can get a factory one from Honda... not sure who manufactures them.

 

Found it, the B18B uses Nippon Thermostat G4000-64269, which is the same one as 2.3L accord and 2000-02 Civic, the Thermostat gasket is Japan (brand) G4031-52541, also shared with 2.3L accord

It seems like all Honda thermostat and gasket are the same, like the oil filter.