Does anyone know the correct gap for Bosch WR70P plugs for a "93 164L? The counter man at Advance said 2.5mm but that seems a bit much. Out of the box they are about 0.675mm. Someone put in a set of NKG plugs and when a miss developed, I tries to pull them for inspection and found that the factory plug wrench wouldn't work because they are 5/8 hex. When I tried to put them back in with my 5/8 spark plug socket they would not release from the socket and the extension would come off the socket leaving it too far down to reach with anything I had..Plugs are still good but am replacing with normal stock plugs.