a standard spark plug should last 10-20K KM...those better/performance type should last 30-50KM....
Spark plug is wear and tear part...
Also life span of spark plug depend on your engine condition...if your engine makan engine oil / wrong tuning then your spark plug will wear out faster.
As mentioned, I'm seaking whether is there any shop selling any FD dashboard and center console. I'm looking for a carbon fibre, carbon-like ones. Most preferable brands are Veilside, Mazdaspeed and RE Amemiya...