I have an 05LX and all I know is that there is only 1 place for the A/C filter which is behind the glove compartment. There are 2 pieces and I replaced them already. My A/C still has a musty smell, now I'm thinking is there some other filters I should replace? Filter near the fresh air vent below the wipers? or something?

 

no, those are the only cabin filters on your car. you need to deodorize your ac system by spraying deodorizors through your ventilation system. the smell occurs sometimes during the year because the vents accumulate condensation and later become mold and begin to smell.