Just like these ones on my old rocker cover before I dropped it
Block the old black box off with a core plug I think its around 35-36mm. You can also use fittings on the rear of the block to vent the crankcase like these
There are some available that you dont have to use an fittings with, I think they are off a prelude.
Here is a link for the -10an block fittings as used on my engine
Managed to source a rocker cover with the an fittings for a catch can Just need to no should I leave the pcv valve in the black box disconnected with the pipe hanging down?