What is this part
 

Had to take the head to a machine shop to have all the old hose fittings pulled out and pressed into the new one. Machinist said he can't get this one out, and he thinks we need to get a new one, problem is we don't know exactly what it is, the Mazda dealership needs to know the exact name. He said there was a big one and a small one, this is the big one. Head is off a 1993 Mazda Mx3 1.6 liter. Any help would be greatly appreciated! https://cimg4.ibsrv.net/gimg/www.maz...d63bddaa46.jpg
https://cimg3.ibsrv.net/gimg/www.maz...334f12d3b1.jpg

The parts department at Mazda should be able to print a picture off of the head showing these pipes/tubes for you to compare.

Looking at the catalog, it appears that these pipe are not serviced separately from the cylinder head itself.