AC Engine thermostat housing?

[pjbowman]

Is there any source for replacement thermostat housings for the AC engine? Mine has a chunk of the inside ‘lip” where the thermostat sits missing. I am assuming this let coolant past the thermostat which is why my engine always runs cool. The thermostat itself seems to be working fine.

[pjbowman]

Have reahed out to Robin Woolmer, looks like the ones he has will do the trick and take a modern thermostat also!