Spark Plug Problem
I am replacing my spark plugs on my 20212 w204 c63 and the shop just called to confirm my parts have arrived. They are insisting the correct plug for the car is the NGK PLKR7A (stock no.4288) which they have bought over for me when i am 110% sure the correct plug for my car is the NGK ILZKAR7A10 Laser iridium.
Is this maybe a new number?
All information will be much appreciated.










