In most cases, the factory thermostat housing is perfectly fine. When it’s not, making a custom housing is not too challenging.
This flange opens up opportunities to Saab swap a RWD setup with ease. Whether needing a straight ‘stat housing or fabricating a a swirl pot, even using a larger radiator hose size, this inexpensive option makes the task easy.
This flange is CNC cut in .500” 6061 aluminim.