Air cleaner base PCV fitting?

Hey all,
I have a 14 inch K&N chrome open element air cleaner and I need to attach a fitting to the bottom of it for PCV inlet that goes from the valve cover to the air cleaner base.
It has the punch outs already there in the base, but I don't know where to come up with the nipple that connects to it.

Any insights on where to get it?
It goes where I circled on this base.

I know I can come up with something to do it if I need to, but if I can just order one would be nice.

Thanks