After having my grey VR apart to do the crack pipe after changing the oil cooler that was putting oil into the coolant, I ended up changing all the housings onto the head because I was just chasing new leaks - in the end the thermostat elbow, sensor housing and crack pipe elbow and all o-ring seals - there were fine little cracks that were allowing coolant to get past the head o-ring 2 - and also the new crack pipe top o-ring into 19 had a little cut in it when donkey here assembled it all up. Those plastics warp and are generally not so good if original. The head o-ring 2 in the pic will run