Factory
I went the factory route even with HD grills, ran into a issue with the factory grills. The center of the grill is solid so thy could add the HD logo, well that perfectly covered and sealed my tweeter in the center of the Polk Dxi's so after just a little sanding around the Polk grills ( OD about 1/16" too big) they fit into the HD enclosures fine and look great. Plus the sound blows away my 6.5' HogTunes in the fairing. I have a pair of HD grills if anyone needs them for what they cost. I even waited 4 weeks for them on Back Order!!