mag thermostat housing?

It took me along time to find a duel plane intake for a 360 mag I am d-tuning.
I ended up finding a NOS one from 03 at a Chrysler dealer.
Anyways, the thermostat housing is way smaller than any LA I am used to.
I assume I need to buy one for a mag, it looks to be about 2.88" between the bolt holes.