What does it matter if the thermostat sits into the housing or into the manifold? There is a recess, and it fits into it. And yes, for the
most part the Chevy parts will fit on the Mopars. I've had great luck with the billet aluminum housings that use an o-ring to seal. No more gaskets or goop:
http://www.summitracing.com/parts/bsp-90820/overview/make/dodge If I needed a 90° unit I'd certainly consider the CVR one with the o-ring:
http://www.summitracing.com/parts/cvs-tsh8cl/overview/make/dodge IMHO the o-ring type is the only way to go if you don't like coolant seepage/leaks. Yes they are expensive, but well worth it.
