Charcoal thick filter ONLY if you have IAQS, otherwise any filter that fits is fine.
If your car is smelling then you need to do a litle more work.
When the filter is out, make up a bleach and water solution and scrub the entire outside air intake and filter area thoroughly. Let dry, repeat.
Spray the vents with Fridgee Fresh after you install the filter and the A/C is running
They all have TWO slots to be able to install the correct filter.
Personally I fell that if you live in a very hot climate, forego the thicker filter no matter which HVAC you have. The thicker filter slightly blocks airflow.
I find that I can use one notch lower on the blower, hence less noise from using the thinner filter.