distributor leak

i just had this shop do a B16A2 swap into my 2k civic ex 5spd. Shortly after i noticed a small oil leak near the distributor. I told them and they said to bring it back up there and they would fix it no charge. After a week they still couldnt fix the leak. They said the only way to fix it was to either find someone with a blown head that would sell that part (slim chance) or buy a whole new head (dealers and Jyards wont sell the piece seperately = too much $$$$). The shop said they wouldnt buy a whole new head cause that would be too much $$$$. the piece i am talkin about is where the distributor bolts up to the head underneath the valve cover and hold down the end of the camshaft.

does anyone know where i can get just that piece???

is it true that that piece is matched to the head from the factory??