I may be putting 6x9 tri's in the rear arm rests. This location may limit the volume if you have rear passengers. Since I rarely have them, I have chosen this location because it's more of an enclosure. It's still in doubt since I'm not going to cut up my originals. I bought a spare pair to cut for the openings... but the seller sold me coupe arm rests. So now I need to find out if they can be altered to fit convertible.
I'm pretty sure (I may have this backwards) you can trim the bottom of the coupes to turn them into converts.