I really like Phoenix Gold stuff. Kinda like MB Quart though, hella expensive.

So right now, for those midbass, I'm looking at these options...
Image Dynamics CX62 or CX64 6"
Phoenix Gold Ti9 Elite (size?)
Eclipse (Fujitsu) ???
JL Audio 0w6-4 or 0w6-8 6"

 

the pgs are 9s

 

9"... hummm... would have to figure a new place to mount them. Don't think I could get 9s under the seat.

 

from the pics they look like they got a low mounting depth

 

Thats what I was worried about. If they were low depth enough, you could almost fit 10" under the seats.