Yesterday I received a thermostat from Renault, which I did not expect to receive. And decide, try to install it before ordering the outer thermostat housing. And not for nothing. So, the flange that comes out of the engine is 38 mm, the plastic tube in the middle (it turned out to be a manifold) is 32 mm, the inlet to the radiator is also 32 mm. there is a branch on the plastic tube - an 8 mm tube, which was not visible from above. Since I don't really like the design with the thermostat in the pipe, I will still order the thermostat housing (somewhat later) with inlets of different diameters, inlet 38 mm, outlet 32 mm 135° + outlet (to the thermostat or after?) 8 mm. In that case, I can use the typical silicone nozzles. 32 mm 90° and straight segment 8-10 cm with a diameter of 38 mm.