Valve springs for the well known Petter AV, AVA, PH & PHW Diesel engines.
Petter part numbers JB56 and JB57 or 336848 and 336849. All of which are now superseded by 390144
The set comprises of one of each spring making a set of two springs, one inner and one outer sufficient for one valve.
You will need to purchase one set per valve, i.e two sets per cylinder head on the engine.