does anyone have any info on the differences between the 2 systems

or coudl they advise me on how best to fit this.

the car ive got has a FRST with zvh in it.

on the left hand side of the engine appears to be the FRST breather/separator - on the RHS appears to be an ERST bailey breather pot! one out from rocker cover, one out from the block, one to waste(atmos) and one blanked off.

it looks a proper abortion at the moment and need to sort it as soon as can.