I'm missing this nipple on the thermostat housing on my B18C. There's a hole for it. I can try to source one from the junk yard, but I can't seem to move them. Any tips on how to remove these nipples? I'm afraid I have to buy a new housing.

The diagram from the GSR shows it connected to the upper water outlet on the head.

The nipple in the green circle is what I'm missing.

 

is there a hole for it?> if not then i might not of had one. my 98+ gsr block doesnt have that nipple.