Hi,
what size speakers is the best for the rear "hat" shelf?
Currently I have Pioneer 180mm (i think?) but are too small for my liking.

I have a set of 6x9s, i tried to see if they fit but i think they're too large?

Any suggestions? I dont think it'd be wise to drill the sheet metal itself?

Also in the front i have 4" Pioneers in the front door. (my dad had installed them about 20 years ago ).. do you think there'd be enough space to install 6inchers there?

Thanks

Patrick