The shallow Daytons aren't subs (midbass, sure), but neither are the speakers under your seats - if you look at the Daytons, you'll see how the frame is pretty wide all the way down, and I don't think anyone will be throwing any into an E92.
Spacers are really driver-specific. We don't even use the same spacers for our SWS that we do for our Jehnerts (ID is different), and when we do Morel 9" (which don't fit the E92, due to height limits) it's totally different again.
Musicar Certified audio upgrades
OE-Look Enclosures for F30/F32/F22/etc
Add-A-Sub and Full-Bass Packages
Full Cabin 3W and 4W Upgrades
F10 Enclosure preorder- contact us for details!