I found this in the audio section here the rear subs , I don't know about the accuracy

-Boss BP6.8 - No modification - direct fit
-Lanzar VW64 - No modification - direct fit
-Pyramid WX65X - No modification - direct fit
-MTX Audio RTX658 - No modification - direct fit
-Boss Audio NP6.4 - No modification - direct fit
-Earthquake Sound SWS-6.5X - No modification - direct fit
-Crossfire XS M6 6" XS - No modification - direct fit
-Kicker CVT654 - No modification - direct fit