Oil pressure pistons with stronger springs for VW beetle typ 1 engines, set, for cases with two pistons.
More oil pressure.
Notice:
Short = flywheel site
Long = pully site
If you had two short plugs (serial) and get to much preasure with the longer plug, please use two short ones!
At cold winter time it is recome to check, if the preasure will not be to high.
Otherwise use the serial sets for cold winter time!
At to much preasure you will damage the oilcooler or add filter for example!