These 4 pins are used to slide the front cross member of T5 Transporters without removing radiators etc. Then it allows sufficient space to carry out some of the maintenance that can't be done ordinarily due to tight space. It is not as good as tearing everything in front of engine though but gives about 10inches extra space.  The bumper still needs to come off but the rest can stay : radiator, condenser, so no need to drain coolant or Aircon gas.  I used them . They do help specially if you don't want to take everything out or drain the engine.

Can't remember the origin of these but it was purchased from Germany.  The VAG VW OEM part number is T10288