I was planning on ordering online...any good recommendations on places to buy the filter and adapter?

EDIT: Anyone have the Part No. for it? (conical) and what is a CEL?


99 Black SE Sport ATX
Running on E1 SVT rims with Dunlop rubber
Pioneer DEH-P3100 CD receiver (2 channels of the amp blown, officially declared dead)
Pioneer DEH-P440 CD receiver
Pioneer TS-6865 6x8's in the front
Pioneer TS-6867 6x8's in the rear
Pioneer TS-WX121 Sub with a Pioneer GM352 amp feeding it