Edelbrock TM5 thermostat size.

Hi good people. Before ordering a new thermostat.. anyone know the diameter of the thermostat I need? I've searched around a bit, but have'nt really found anything. The manifold is as stated in topic, an ancient TM5.

There isn't really any housing, just the barb for the rad-hose on a flange bolted on the manifold, so I'm guessing a low profile stat is the way to go?

Thanks for your time.
Runar.