Breather cap
Just one breather and a PCV I would think. I have seen two breathers before but only on HP race cars with some guys running their PCV straight to the exhaust. You could put a breather on the passinger side in place of the oil filler cap...and use it "as" the filler cap. Your drivers side can be used for a PVC and will ex-spel the gases out back into the carb to be re-burned. Perhaps again some just use one breather for both (not sure if it's a good idea). I noticed your pic...I'm getting the same covers. My passenger side will have my breather and the drivers side forward will be my oil filler and I'm drilling out the rear plug, using a gromit for my PVC.