Peerless GBS-115N25AL01-04 mid, in the Sportback door card. I had to space it away from the grill to avoid the dome contacting the grill surround. I just used nuts and washer to get it where I wanted, but then had to seal the edges to avoid phase problems from the rear wave, etc. Using a space ring would be better, but I didn't have any the right size and was too lazy to make one. Can't remember if Bobby Kinstle detailed what he did, worth checking on his S4 thread when it comes time to install.
